T25 Alternative Engine Forum

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Last post

Petrol Alternative Engines...

Last post by silverbullet « 06 Apr 2024, 16:09
Replies: 10
by HarryMann » 15 Oct 2005, 01:57

Subaru Engine Types and Options

The normally aspirated (NA) flat 4's weigh about the same as a WBX and after installation there's always a cleaner...

10 Replies

75303 Views

Last post by silverbullet
06 Apr 2024, 16:09
Diesel Alternative Engines..... Read before asking questions

Last post by sdelasal « 09 Aug 2008, 22:43
Replies: 18
by admin » 13 Oct 2005, 09:35
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VW are renowned for their diesels and those fitted as standard to the T25 do not do it justice. What can you replace them with to getting better...
18 Replies

117857 Views

Last post by sdelasal
09 Aug 2008, 22:43
Engine swop question

Last post by colinthefox « Yesterday, 21:08
Replies: 1
by aimlessrock » Yesterday, 19:43

Hi,

I was looking at the engine in my t25 and noticed that someone has tipped the letters AEF on it.

It looks different to the pictures of the...

1 Replies

29 Views

Last post by colinthefox
Yesterday, 21:08
AAZ upgrade turbo and realistic power

Last post by syncroandy « 08 Jul 2025, 14:55
Replies: 1
by TommyJenko » 21 Jun 2025, 16:40

Hi guys I have a AAZ in bits that came with my van, I was going to rebuild it but looking at the turbo it’s a kkk-k03 which seems a bit small for the...

1 Replies

383 Views

Last post by syncroandy
08 Jul 2025, 14:55
1.8T Sump Bolt Access

Last post by Vaughanylive « 06 Jul 2025, 07:43

by Vaughanylive » 06 Jul 2025, 07:43

I’ve got a 1.8T converted Syncro (AUM stamped block, but cable throttle) with a custom mild-steel sump made by whoever did the conversion. The paint...

0 Replies

118 Views

Last post by Vaughanylive
06 Jul 2025, 07:43
AHU TDI Vibration Damper Pulley testing

Last post by hotpod « 28 Jun 2025, 08:52
Replies: 8
by hotpod » 31 Mar 2025, 15:29

Does anyone know how to test if the vibration damper pulley ( harmonic balancer) on the crank shaft is in good shape?
Mine drives the ribbed...

8 Replies

4887 Views

Last post by hotpod
28 Jun 2025, 08:52
AAZ VS Air cooled

Last post by davidoft1 « 27 Jun 2025, 22:14
Replies: 3
by davegeezzer008 » 27 Jun 2025, 19:58

Im having problems getting my AAZ pump rebuilt as bosch don't make many parts for the VE pump any more, so I'm just thinking ahead about my options...

3 Replies

327 Views

Last post by davidoft1
27 Jun 2025, 22:14
AGG seized - Oil starvation on steep inclines?

Last post by silverbullet « 20 Jun 2025, 06:42
Replies: 15
by Hansa » 04 May 2025, 10:24
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Not quite the first post I planned to make, but 2k miles after buying an AGG engined '86 Syncro, it stalled as I pulled into my garage. 30 minutes of...
15 Replies

3551 Views

Last post by silverbullet
20 Jun 2025, 06:42
TDI annoying pause when pulling away

Last post by syncroandy « 15 Jun 2025, 16:14
Replies: 9
by hotpod » 06 Jun 2025, 09:22

1997 AHU ETDI
The question is: When I first pull away in the van, it starts moving then has an annoying momentary drop in revs after which it is...

9 Replies

460 Views

Last post by syncroandy
15 Jun 2025, 16:14
Subaru ej20 engine swap education wiring

Last post by R0B « 15 Jun 2025, 09:39
Replies: 3
by Mansfldfox » 12 Jun 2025, 16:09

Hi I have a 1984 t25 campervan which I have fitted a Subaru ej20 non turbo engine I need help with the wiring of the Ecu i have both the Subaru and...

3 Replies

268 Views

Last post by R0B
15 Jun 2025, 09:39
Alternator/water pump drive belt - adjustment

Last post by Lio « 12 Jun 2025, 17:21
Replies: 8
by Bison535 » 04 Oct 2024, 02:27

Hi 80-90 guys
There always seems a need to make adjustment to the tension of my drive vee belt ! Once I hear a squeal I know it needs adjustment...

8 Replies

22189 Views

Last post by Lio
12 Jun 2025, 17:21
Oil Capacity (Diesel 1Y Engine)

Last post by The Hairy Camper « 10 Jun 2025, 15:54
Replies: 2
by The Hairy Camper » 10 Jun 2025, 15:40

Just replaced a leaky sump gasket/baffle plate. Drained all the oil, replaced oil filter, and refilled with 4.5L of 15W40 oil. However, the dipstick...

2 Replies

211 Views

Last post by The Hairy Camper
10 Jun 2025, 15:54
1z tdi ecu

Last post by bundyboy « 10 Jun 2025, 08:34
Replies: 5
by Wallace748 » 14 Oct 2015, 19:03

Hi, I'm running a 93/94 1z tdi with the 68 pin ecu. Struggling to get coms via diagnostic plug( it's the old two pin type) anyone help me out with...

5 Replies

3437 Views

Last post by bundyboy
10 Jun 2025, 08:34
4 digit pin code for AHU ECU Login?

Last post by hotpod « 30 May 2025, 07:47
Replies: 4
by hotpod » 29 May 2025, 08:20

Does anyone know a way to find the 4 digit pin that VCDS requires to be able to do things like add new keys?
I've been reading a lot of forums but...

4 Replies

551 Views

Last post by hotpod
30 May 2025, 07:47
1Y coolant pipes/system

Last post by colinthefox « 21 May 2025, 20:34
Replies: 15
by BarnyE » 30 Mar 2025, 14:20
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Hi all, my van has had a 1Y engine swap in the past. Whoever swapped it seemed to have ran out of enthusiasm once the got to the coolant system and...
15 Replies

5566 Views

Last post by colinthefox
21 May 2025, 20:34
Subaru Engine Identification Needed

Last post by Basilakios « 20 May 2025, 16:25
Replies: 5
by Basilakios » 19 May 2025, 21:41

Hi!
I've very recently bought a new (to me) T25 which has a Subaru engine. I wasn't especially looking for one with a Subaru engine but it drove...

5 Replies

997 Views

Last post by Basilakios
20 May 2025, 16:25
1.8T Wiring/Fault Codes

Last post by Splurt « 17 May 2025, 10:54
Replies: 17
by Vaughanylive » 29 Apr 2025, 18:44
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I’ve got a T25 Syncro with a 1.8T conversion (AGU) which seems to be running ok but out of curiosity I plugged it into my VCDS Lite which is showing...
17 Replies

5982 Views

Last post by Splurt
17 May 2025, 10:54
AHU immobiliser stuck on. Help please

Last post by hotpod « 14 May 2025, 09:27
Replies: 6
by hotpod » 03 May 2025, 09:41

1997 VW Golf AHU tdi in a T3 van. Installed in 2014

I went to leave work the other evening and the van started for a second and then died. I am...

6 Replies

3042 Views

Last post by hotpod
14 May 2025, 09:27
Is it possible to determine the buildyear from a engine number?

Last post by Aidan « 12 May 2025, 17:38
Replies: 5
by busbart » 10 May 2025, 15:12

I wonder, is it possible if you have the type and engine number to determine the year when that engine was build?

VW 1Y 1,9D/TD 368 772

5 Replies

1573 Views

Last post by Aidan
12 May 2025, 17:38
The SA 2.6i Microbus thread

Last post by silverbullet « 09 May 2025, 19:58
Replies: 244
by silverbullet » 23 Mar 2011, 12:07
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I appreciate that this is pretty obscure but here goes...broke down in the 2.6 SA on Friday, had to be recovered :oops: thought I had fixed it with a...
244 Replies

227146 Views

Last post by silverbullet
09 May 2025, 19:58
Leaking Cooling Pipe Replacement

Last post by Jdavis « 03 May 2025, 05:39
Replies: 4
by Jdavis » 04 Mar 2025, 08:49

Hello all. New to the site and to T25 ownership.

I have a 1982 T25 Camper with a refurbished 2l Golf engine. The coolant pipe has a big leak and I'm...

4 Replies

24474 Views

Last post by Jdavis
03 May 2025, 05:39
Sump Plug

Last post by Aidan « 27 Apr 2025, 14:32
Replies: 7
by Burtybassett » 26 Apr 2025, 10:47

Trying to change the oil and the blasted Sump Plug won't undo.

Engine is cold and not been run today. Would it help if engine is warm ??

What to...

7 Replies

7869 Views

Last post by Aidan
27 Apr 2025, 14:32
aey engine

Last post by Vwt25campee « 26 Apr 2025, 09:29
Replies: 10
by warrior.1229 » 05 Feb 2015, 20:56

hi i am new to the t25 scene my wife has just bought me my first van but unfortunately the chap saw us coming it is a 1.6 cs diesel engine but i need...

10 Replies

8638 Views

Last post by Vwt25campee
26 Apr 2025, 09:29
Exhaust falling off

Last post by silverbullet « 23 Apr 2025, 18:07
Replies: 4
by therealchrisgray » 23 Apr 2025, 10:40

Hi all, I could use some opinions so I'm not completely at the mercy of a mechanic.

Exhaust started blowing yesterday on a motorway run. I've done...

4 Replies

3986 Views

Last post by silverbullet
23 Apr 2025, 18:07
VCDS Fault code deciphering AHU TDI

Last post by hotpod « 23 Apr 2025, 09:35

by hotpod » 23 Apr 2025, 09:35

I know why the vehicle speed signal is wrong and what I need to fix it but the ECU memory error is troubling and can anyone tell me what the...

0 Replies

4038 Views

Last post by hotpod
23 Apr 2025, 09:35
Engine Swap

Last post by Dueller « 18 Apr 2025, 11:41
Replies: 6
by Tattersall » 14 Jan 2025, 03:13

Hi I really want to build a camper and I've seen a few t3s with broken engines. If I buy a 2.1 that has no engine in. What would be easies/best for a...

6 Replies

22173 Views

Last post by Dueller
18 Apr 2025, 11:41
Alternators.. inline 4 engines

Last post by Dueller « 18 Apr 2025, 11:31
Replies: 6
by t25adict » 08 Apr 2025, 15:24

Would anyone know which engines VW Seat Audi used the alternator with the big spring under it.

It's the ones that bolt up for belt tension, but you...

6 Replies

4269 Views

Last post by Dueller
18 Apr 2025, 11:31
Diesel Engine Code Location

Last post by T25boy71 « 11 Apr 2025, 09:26
Replies: 6
by The Hairy Camper » 06 Apr 2025, 18:54

I was struggling to find the engine code on my 1Y today.

From what I can tell on the forum, it's meant to be in this location:

I couldn't see...

6 Replies

4343 Views

Last post by T25boy71
11 Apr 2025, 09:26
AEF (1.9D) engine, troubleshooting advice pls

Last post by therealchrisgray « 17 Mar 2025, 11:03
Replies: 7
by therealchrisgray » 15 Mar 2025, 09:38

Finally collected my van yesterday with its new old AEF engine. All seemed good at first, but then...

Pootling along, at any speed, I get an...

7 Replies

29508 Views

Last post by therealchrisgray
17 Mar 2025, 11:03
little advice pls

Last post by JeffRoo « 13 Mar 2025, 20:08
Replies: 17
by fh9977 » 04 Nov 2024, 12:05
1

2
Hi, just need some advice on what I do with my syncro...

A few weeks ago I had a breakdown, diesel pump had ceased. Pump was refurbished,...
17 Replies

36904 Views

Last post by JeffRoo
13 Mar 2025, 20:08
engine change from jx to 1z

Last post by Oren Kipnis « 12 Mar 2025, 19:14
Replies: 1
by rossin84 » 10 Mar 2025, 08:15

good morning everyone, I am writing from Sicily (Italy), my multivan t3 bluestar 1.6 td jx has a blown engine, unfortunately it cannot be fixed and I...

1 Replies

17780 Views

Last post by Oren Kipnis
12 Mar 2025, 19:14
New engine

Last post by therealchrisgray « 01 Mar 2025, 13:38
Replies: 10
by therealchrisgray » 12 Feb 2025, 15:53

Hello all, I need some pretty basic advice and hoping one of you lovely people can help.

My unidentified old diesel engine turned out to be a 1Y...

10 Replies

23897 Views

Last post by therealchrisgray
01 Mar 2025, 13:38
New van with cologne v6 engine

Last post by Dueller « 28 Feb 2025, 17:30
Replies: 47
by Cableguy » 27 Jun 2010, 17:55
1

2

3

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Hi, I'm a newbie to this forum and also to the t25.
I've just bought a camper with an old school 2.8 cologne engine in it.
As soon as I turned the...
47 Replies

86762 Views

Last post by Dueller
28 Feb 2025, 17:30
EJ20E Lambda Wiring.

Last post by JackJosh « 07 Feb 2025, 21:34
Replies: 4
by JackJosh » 20 Jan 2025, 14:33

Hi All,

I was looking for some advice, if possible.
I have a VW T3 van and it has an EJ20e fitted. It also has an LPG system that I am unlikely to...

4 Replies

20645 Views

Last post by JackJosh
07 Feb 2025, 21:34
Jx flywheel on 1Y block

Last post by curtainsider « 28 Jan 2025, 17:55
Replies: 2
by curtainsider » 28 Jan 2025, 16:26

Hello all’

Can someone remind me if I need to re-mark my JX flywheel to TDC when fitted to a 1y or AAZ. Engine currently out of van with Jx...

2 Replies

18792 Views

Last post by curtainsider
28 Jan 2025, 17:55
Can a 1Y inlet manifold be modified to fit

Last post by colinthefox « 27 Jan 2025, 20:21
Replies: 3
by VwDanT25 » 04 Oct 2024, 19:20

Hi

completed a 1Y swap but using a turbo inlet manifold for the time being, the 1Y inlet mf wont fit due to hitting the bay wall.
has anyone...

3 Replies

20484 Views

Last post by colinthefox
27 Jan 2025, 20:21
Subaru ez30d h6, 4eat auto gearbox in a coachbuild

Last post by jamiegolf « 15 Jan 2025, 10:19
Replies: 61
by jamiegolf » 15 Oct 2023, 08:48
1

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3

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Hey all,
After running around for a year with the ej20 and aap box (that’s been absolutely perfect btw!!) I feel it just needs. Little more oomph!!...
61 Replies

249853 Views

Last post by jamiegolf
15 Jan 2025, 10:19
No water temperature reading

Last post by slowcoach « 02 Jan 2025, 13:38
Replies: 3
by boxerairhead » 28 Dec 2024, 17:41

I've recently bought a T25 with an EJ20 engine in it. It all works and drives fine except the water temperature gauge doesn't work.
So far i've done...

3 Replies

20802 Views

Last post by slowcoach
02 Jan 2025, 13:38
Help on a Essex V6

Last post by TwinTurbo « 25 Nov 2024, 21:30
Replies: 11
by MyBlueT25 » 25 Nov 2024, 16:40

I have a 81 tintop with a v6 essex and struggling to get it started, ive replaced pretty much everything to do with spark and fuel except the...

11 Replies

26521 Views

Last post by TwinTurbo
25 Nov 2024, 21:30
Clutch Rattle

Last post by silverbullet « 10 Oct 2024, 14:36
Replies: 3
by BigBlueVan » 01 Oct 2024, 19:25

Hi All,

I have been trying to get my clutch to release on my conversion, ej20 engine, RJES bellhousing and release bearing, VW clutch disc....

3 Replies

20037 Views

Last post by silverbullet
10 Oct 2024, 14:36
Injector Flame Traps

Last post by johnxl « 04 Oct 2024, 22:23
Replies: 6
by johnxl » 03 Sep 2024, 14:09

Where on the injector should a flame trap seat? against the injector body or on the injector nozzle? The reason why I ask is because while checking...

6 Replies

22164 Views

Last post by johnxl
04 Oct 2024, 22:23
turbo hose

Last post by skell « 19 Sep 2024, 22:27
Replies: 1
by morganite » 22 Jul 2024, 16:01

Hi on last leg of aaz conversion, i need a hose to go from jx turbo to aaz inlet manifold, anyone know where to find one? or even better the part no...

1 Replies

18780 Views

Last post by skell
19 Sep 2024, 22:27
aaz pump repair

Last post by skell « 19 Sep 2024, 22:22
Replies: 1
by morganite » 12 May 2024, 18:51

Hi can anyone recommend a reasonable diesel injection pump engineering shop, to test and maybe repair, my 0460494346 injection pump to go on my AAZ...

1 Replies

18992 Views

Last post by skell
19 Sep 2024, 22:22
Clutch problems

Last post by Aidan « 19 Sep 2024, 18:29
Replies: 3
by Nelpy » 17 Sep 2024, 21:04

Hi

I’ve been having clutch problems for a while now - pedal going hard then soft, pedal moving up and down against my foot, clutch slipping,...

3 Replies

20249 Views

Last post by Aidan
19 Sep 2024, 18:29
Identifying engine

Last post by therealchrisgray « 17 Sep 2024, 10:49
Replies: 9
by therealchrisgray » 07 Sep 2024, 11:09

Hi all, my google skills are obviously not up to this but thankfully this forum is full of knowledgable people...

My old van had an engine...

9 Replies

23692 Views

Last post by therealchrisgray
17 Sep 2024, 10:49
EJ Subaru Engine - Fuel Breather Line

Last post by BigBlueVan « 14 Sep 2024, 20:14
Replies: 3
by BigBlueVan » 13 Sep 2024, 05:36

Hi All,

What have others done with the fuel breather line on their Subaru conversions?
The EJ engine has fuel feed, return and breather...

3 Replies

19913 Views

Last post by BigBlueVan
14 Sep 2024, 20:14
EJ Subaru Engine, vacuum non return valve

Last post by slowcoach « 08 Sep 2024, 22:07
Replies: 3
by BigBlueVan » 08 Sep 2024, 14:01

Hi All,

Original van engine 1.9dg had a one way valve on the vacuum line at the engine.
The Subaru EJ engine removed from donor vehicle did not have...

3 Replies

20001 Views

Last post by slowcoach
08 Sep 2024, 22:07
N108 valve 1.9TDI MK3

Last post by Aidan « 07 Sep 2024, 16:03
Replies: 2
by Iwallace » 07 Sep 2024, 09:00

Hi all.

My n108 valve on my mk3 1998 1.9TDI engine has been playing up for months now.
Has been repaired once but the wires keep coming loose with...

2 Replies

19189 Views

Last post by Aidan
07 Sep 2024, 16:03
Diesel leaking from pump?

Last post by ZsZ « 07 Sep 2024, 14:33
Replies: 5
by Jezzerisin » 04 Sep 2024, 19:51

Having recently posted about my electric problems..
Things got worse!
Driving on a Spanish motorway, the throttle stuck open, full speed!!
Couldn't...

5 Replies

21195 Views

Last post by ZsZ
07 Sep 2024, 14:33
Oil buzzer at end of long drive

Last post by Middle29 « 04 Sep 2024, 15:19
Replies: 7
by Middle29 » 02 Sep 2024, 11:33

Hi all,

Drove back from Devon yesterday 255 miles. The buzzer went off pulling into the services, sharp left turn decelerating about half way back....

7 Replies

23012 Views

Last post by Middle29
04 Sep 2024, 15:19

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