T25 Alternative Engine Forum

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Most liked posts	Author	Posted	Liked	Forum
Which gearbox.	cobblers	13 Mar 2026, 13:26	Once this week	T25 Alternative Engine Forum

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Last post

Coolant leak issues

Last post by SurfT25 « 30 Jun 2023, 15:56
Replies: 23
by pleasestartnow » 19 Jun 2023, 14:45
1

2
Another day another question.

I have had a leaky oil sump for years now, possibly even since I first got it 10 years ago. It only leaks after the...
23 Replies

18281 Views

Last post by SurfT25
30 Jun 2023, 15:56
Is this the correct hose set?

Last post by Negativegravity « 25 Jun 2023, 17:45

by Negativegravity » 25 Jun 2023, 17:45

On our way to a campsite this weekend, a hose split between above the oil cooler. I managed to cut the split bit off, and reattach with more water...

0 Replies

45009 Views

Last post by Negativegravity
25 Jun 2023, 17:45
Am I missing a nut on the throttle mechanism?

Last post by pleasestartnow « 14 Jun 2023, 21:00
Replies: 6
by pleasestartnow » 14 Jun 2023, 12:16

I'm just doing the air, oil and fuel filter changes and I noticed on the top of my throttle mechanism it looks like I'm missing a nut? Now at the...

6 Replies

8311 Views

Last post by pleasestartnow
14 Jun 2023, 21:00
Rebuild Vs Engine Swap ?

Last post by herman_t25 « 13 Jun 2023, 09:36
Replies: 3
by herman_t25 » 12 Jun 2023, 18:07

Hi all,

so wanted so advise or opinions on what I should do with my engine. I currently have the 1.9L WBX in my van but as its coming up to its 39th...

3 Replies

8086 Views

Last post by herman_t25
13 Jun 2023, 09:36
Engine upgrade by busmiester

Last post by clift_d « 12 Jun 2023, 13:43
Replies: 11
by Marktwain » 28 May 2023, 22:22

1.6 TD in van is pushing 190k miles, still runs but starting becoming a bit precarious. So booked in for vw 1.9 tdi variable vane turbo to be fitted...

11 Replies

10595 Views

Last post by clift_d
12 Jun 2023, 13:43
JX to AGG Conversion

Last post by Spailpin Fanach « 04 Jun 2023, 17:46
Replies: 2
by Spailpin Fanach » 04 Jun 2023, 09:23

Hi all

I'm having a lot of hassle with my insurance company who refused to countenance any upgrade or conversion to my 1989 1.6TD JX T25 Westy. They...

2 Replies

7774 Views

Last post by Spailpin Fanach
04 Jun 2023, 17:46
Syncro AAZ turbo leaking oil

Last post by fh9977 « 09 May 2023, 11:40

by fh9977 » 09 May 2023, 11:40

Hi folks,
Just had the van inspected for an oil leak on coming out of the turbo. Garage said that turbo is fine but it will leak because of the way...

0 Replies

45320 Views

Last post by fh9977
09 May 2023, 11:40
Passat 1.9tdi conversion

Last post by Smudgersmith « 05 May 2023, 16:27
Replies: 6
by Smudgersmith » 05 May 2023, 07:54

Hi all i currently get 20 mpg from my 2.0 cu Aircooled engine.Wich is normal as far as i know.
But realy want to do some longer trips so with fuel...

6 Replies

8829 Views

Last post by Smudgersmith
05 May 2023, 16:27
Help with running issues 1.9 TD aaz engine in new T25 Purchase

Last post by Gavrilo « 05 May 2023, 13:35
Replies: 2
by Blix99 » 02 May 2023, 14:53

Hello. (Apologies- I posted in the wrong area. Moderation moved - thanks : )

I wonder if anyone has any advice or experience with the 1.9 AAZ,...

2 Replies

8822 Views

Last post by Gavrilo
05 May 2023, 13:35
Fitting Wolfy Exhaust

Last post by ELVIS « 22 Apr 2023, 12:04
Replies: 7
by MidLifeCrisis » 16 Apr 2023, 21:37

Hoping for a little sanity check before I decide to just add spacers;
I am fitting a wolfy exhaust to an AGG engine;
The left and right exhaust...

7 Replies

10513 Views

Last post by ELVIS
22 Apr 2023, 12:04
1Z timing belt change interval

Last post by davidoft1 « 08 Apr 2023, 17:08
Replies: 4
by ZsZ » 03 Apr 2023, 09:25

I am in a dilemma. As per title. To change or not to change? Last change was done 5 yrs and ~40k kms ago. Before I read a 5yr 60k kms interval...

4 Replies

8647 Views

Last post by davidoft1
08 Apr 2023, 17:08
New engine needed

Last post by Aidan « 04 Apr 2023, 07:10
Replies: 5
by Spailpin Fanach » 02 Apr 2023, 12:53

I haven't been on here for several months since my beloved 1989 VW 1.6TD JX T25 Westfalia mistook in T in T25 for Tea, boiled and cracked the...

5 Replies

8763 Views

Last post by Aidan
04 Apr 2023, 07:10
Fuel leak diesel

Last post by ELVIS « 31 Mar 2023, 22:54
Replies: 14
by T25boy71 » 07 Mar 2023, 15:20

Engine is 1Z fuel pump mechanical of what I have no idea
Any advice very welcome

14 Replies

16556 Views

Last post by ELVIS
31 Mar 2023, 22:54
Engine hatch cutting

Last post by silverbullet « 28 Mar 2023, 07:19
Replies: 9
by glennada » 17 Mar 2023, 18:25

Hello all,
Stupid questions follow...

I hear that if you install an AAZ into t25 the you have to cut the engine hatch.
Can the engine mounts not...

9 Replies

9372 Views

Last post by silverbullet
28 Mar 2023, 07:19
1.9 Diesel 1Y exhaust

Last post by ajsimmo « 12 Mar 2023, 11:04
Replies: 4
by Sammyd » 11 Mar 2023, 13:06

Any advice on what exhaust to use on a 1Y engine conversion?

The exhaust fitted by previous owner is incredibly loud!!

I’m not expecting quiet out...

4 Replies

7869 Views

Last post by ajsimmo
12 Mar 2023, 11:04
engine

Last post by mrhutch « 07 Mar 2023, 21:31
Replies: 4
by blackhawk » 07 Mar 2023, 21:01

Hi all need your help, have a 1.9 diesel engine fitted to my camper, but not sure which engine it is & cannot find an engine number anywhere on it,...

4 Replies

7854 Views

Last post by mrhutch
07 Mar 2023, 21:31
Buying an AHU Engine. What to look for.

Last post by Al Housman « 02 Feb 2023, 19:18

by Al Housman » 02 Feb 2023, 19:18

A bit late this but I'm going to look at an AHU engine in a Mk3 Golf tomorrow. It has about 100k on it whch is born out by its MOT history.
Apart...

0 Replies

44361 Views

Last post by Al Housman
02 Feb 2023, 19:18
AVB engine from a 2002 A4?

Last post by Aidan « 02 Feb 2023, 08:15
Replies: 1
by FifeBay » 01 Feb 2023, 19:50

Hello, I’m new to the forum and picking up a T25 Doka at the weekend. It’s a 1988 with a 1.6JX engine which is seized and potentially completely...

1 Replies

7108 Views

Last post by Aidan
02 Feb 2023, 08:15
so c'mon, is the AAZ conversion worth it?

Last post by davidoft1 « 08 Jan 2023, 18:41
Replies: 29
by charlie brown syndrome » 14 Jul 2010, 20:46
1

2
hi all,

right,
ive recently bought a van and after mulling through the different information ive decided to go for the AAZ conversion, mainly...
29 Replies

51106 Views

Last post by davidoft1
08 Jan 2023, 18:41
Diesel engine bars

Last post by mike the van « 07 Jan 2023, 14:29
Replies: 5
by mike the van » 06 Jan 2023, 18:13

Ok, I know the question has been asked before, but trying to work through collecting parts for an Aircooled to GTI conversion, body and underside of...

5 Replies

8455 Views

Last post by mike the van
07 Jan 2023, 14:29
1.8 GTI Digifant exhaust manifold fun!

Last post by Aidan « 20 Dec 2022, 07:36
Replies: 2
by Garax21 » 19 Dec 2022, 20:00

Hello wise people I have a converted T25 with a 1.8 GTI Mk2 digifant engine installed. Having replaced a long list of bits due to its age the next...

2 Replies

3629 Views

Last post by Aidan
20 Dec 2022, 07:36
1Y fuel injectors

Last post by mrhutch « 09 Dec 2022, 10:38
Replies: 3
by Glennerdous » 04 Dec 2022, 17:54

Hi guys I've had my T25 now for nearly 6 years, it had a 1Y engine fitted when purchased and I've kept it because its pretty solid (slow but solid)...

3 Replies

3919 Views

Last post by mrhutch
09 Dec 2022, 10:38
Alternative Gearboxes for the VW T25

Last post by Aidan « 07 Dec 2022, 16:34
Replies: 6
by josephcarey1 » 28 Oct 2022, 16:50

Hi All,

Ok so this might have been spoken about before, but I'm yet to find a thread that goes into detail about other options. Apologies if this...

6 Replies

6901 Views

Last post by Aidan
07 Dec 2022, 16:34
1y aux belt

Last post by ESPANTA « 01 Dec 2022, 06:58
Replies: 26
by weldore » 31 Jul 2011, 15:06
1

2
does the aux belt send the water pump clockwise or anti-clockwise ?

..cheers dave
26 Replies

17713 Views

Last post by ESPANTA
01 Dec 2022, 06:58
2.0 FSI Engine in T25

Last post by silverbullet « 26 Nov 2022, 10:50
Replies: 2
by timscarth » 13 Nov 2022, 19:52

Hi all, hope you can help me with answering this.

I have a 1983 T25 with a broken 1.9DG engine (needs head gaskets doing). I also have a 2006 Seat...

2 Replies

1871 Views

Last post by silverbullet
26 Nov 2022, 10:50
Regeared gearbox question

Last post by CoalMarx « 25 Nov 2022, 16:38
Replies: 6
by CoalMarx » 25 Nov 2022, 08:01

Hi all, simple question. Is there somewhere where you can buy a regeared gearbox suitable for stronger engines, then just swap over at the same time...

6 Replies

2177 Views

Last post by CoalMarx
25 Nov 2022, 16:38
T3 1986 / Glf 1.9 SDI Exhaust Question

Last post by Rickbarr « 08 Nov 2022, 02:35
Replies: 2
by Rickbarr » 01 Nov 2022, 12:36

Hello all, fairly new to forum and owning my 1986 T3 Hightop .The exhaust has gone for the worse. I d like to replace the lot rather than weld and...

2 Replies

1601 Views

Last post by Rickbarr
08 Nov 2022, 02:35
Alternative and much cheaper fuel pressure regulator for na EJ20 subaru engine

Last post by mshaw1980 « 06 Nov 2022, 18:35
Replies: 2
by mshaw1980 » 06 Nov 2022, 00:43

Hi all

Had a problem burning out fuel pumps which was finally found to be a broken fuel pressure regulator which caused so much of a constriction...

2 Replies

3297 Views

Last post by mshaw1980
06 Nov 2022, 18:35
1.9 1Y Fuel Injection Pump

Last post by Oldiebut goodie « 02 Nov 2022, 09:06
Replies: 16
by The Hairy Camper » 29 Mar 2019, 15:41
1

2
Hi people, i was removing the electrics from my 1Y engine today and i noticed that the fuel injection pump looks a little different from my original...
16 Replies

11582 Views

Last post by Oldiebut goodie
02 Nov 2022, 09:06
Alternatives to 2.0l Aircooled CU engine

Last post by shepster « 29 Oct 2022, 13:37
Replies: 14
by RichieCrow » 13 Oct 2022, 11:38

Hi- I have a 1981 T25 with a 2.0l Aircooled CU petrol engine. Said engine is knackered and needs replacing. Is there any alternative engines that...

14 Replies

5463 Views

Last post by shepster
29 Oct 2022, 13:37
VW/Audi 1.8t engine conversion.

Last post by escovedo « 29 Oct 2022, 07:43

by escovedo » 29 Oct 2022, 07:43

Has any forum member fitted the VW/Audi 1.8t engine?
It's a compact power unit with good power and reasonable fuel economy.

0 Replies

2515 Views

Last post by escovedo
29 Oct 2022, 07:43
How to make the brick fly?

Last post by DoubleOSeven « 21 Oct 2022, 14:04
Replies: 1
by CoalMarx » 21 Oct 2022, 10:15

Hi folks, after a failed attempt to buy an air-cooled T25 me and my Dad, who's not a VW specialist but a lifer as a mechanic (now retired) have our...

1 Replies

1616 Views

Last post by DoubleOSeven
21 Oct 2022, 14:04
1.6D CS upgrade to 1.9TD AAZ

Last post by nokia7799 « 18 Oct 2022, 20:13

by nokia7799 » 18 Oct 2022, 20:13

Hi

I am currently changing my 1984 T25 engine from its original 1.6 D CS to a 1.9 TD AAZ which i had as a donor engine. I have the engine and...

0 Replies

2497 Views

Last post by nokia7799
18 Oct 2022, 20:13
AAZ (syncro) Aux coolant pump/switch

Last post by steve770 « 02 Oct 2022, 17:25
Replies: 3
by steve770 » 30 Sep 2022, 19:41

Hi folks, recently went out to find the new van had a flat battery which turned out to be due to the Aux afterrun pump permanently running after the...

3 Replies

1751 Views

Last post by steve770
02 Oct 2022, 17:25
1.9tdi Oppertunity

Last post by Oren Kipnis « 26 Sep 2022, 15:54
Replies: 5
by SimonD » 03 Sep 2022, 15:38

Hi Guys,

I have been trying to read as much as I can on the forums about the 1.9tdi AHU engine.

I have had a look on the wikipedia page for VW...

5 Replies

2871 Views

Last post by Oren Kipnis
26 Sep 2022, 15:54
Exhaust

Last post by dogbreath100 « 24 Sep 2022, 12:43
Replies: 2
by dogbreath100 » 24 Sep 2022, 09:20

Hi , I am looking for recommendations for a exhaust pipe that goes from the manifold
to the silencer . I replaced one about 5 years ago and now it...

2 Replies

1733 Views

Last post by dogbreath100
24 Sep 2022, 12:43
Exhaust manifold for T3 Pick up 1z conversion

Last post by skirk « 20 Sep 2022, 13:30

by skirk » 20 Sep 2022, 13:30

My van is currently having a conversion to a 1z engine. The old manifold has no waste gate outlet. The 1z does but the flange is at completely the...

0 Replies

2475 Views

Last post by skirk
20 Sep 2022, 13:30
Engine I D ?

Last post by PeteandNikki « 20 Sep 2022, 11:25
Replies: 2
by PeteandNikki » 19 Sep 2022, 19:55

Need some help from the diesel gurus on here.
About 5 years ago(when I thought I had more time than it turns out that I actually do have!) I bought...

2 Replies

1778 Views

Last post by PeteandNikki
20 Sep 2022, 11:25
3l V6 Ford Conversion

Last post by Robsey « 17 Sep 2022, 11:54
Replies: 1
by MyBlueT25 » 15 Sep 2022, 09:42

Hi, I have a JL3000 which as some of you know is a South African Essex V6 conversion on vans from the factory and sold in the SA VW forecorts, its...

1 Replies

1710 Views

Last post by Robsey
17 Sep 2022, 11:54
real mpg figures for T3's V T4's

Last post by clift_d « 07 Sep 2022, 07:46
Replies: 14
by t25adict » 12 Jun 2022, 19:39

so.. we have a 1.9td t4 short wheel base window van. (not a camper)
and I am working on our t3 crew cab which at this point is a 1.9td (aaz).

we are...

14 Replies

8449 Views

Last post by clift_d
07 Sep 2022, 07:46
AGG gearbox code choice.

Last post by ZsZ « 29 Aug 2022, 13:40
Replies: 8
by kevtherev » 14 Mar 2021, 04:54

I use a standard petrol engine (DG) gearbox on spec diameter wheels and tyres, on my ADY powered hightop.
Is it wrong to assume that the extra power...

8 Replies

8187 Views

Last post by ZsZ
29 Aug 2022, 13:40
Apk gen v git

Last post by silverbullet « 15 Aug 2022, 06:11
Replies: 18
by axeman » 05 Dec 2021, 21:54
1

2
Hi all fitting a mk4 golf gti engine at 50 degrees.also converting the manual to an auto
Always worth asking vw (tps) for the cost of parts. Cam...
18 Replies

8016 Views

Last post by silverbullet
15 Aug 2022, 06:11
So a customer brings me a DJ core...

Last post by silverbullet « 09 Aug 2022, 15:45
Replies: 6
by silverbullet » 08 Aug 2022, 15:38

All original VW Bruss seals and factory Elring gaskets, but stamped R-C where the engine number should be. Flanged hex head bolts on the flywheel...

6 Replies

2228 Views

Last post by silverbullet
09 Aug 2022, 15:45
What bits would I need off a donor car for a 1.8T conversion?

Last post by mike.g « 09 Aug 2022, 15:11

by mike.g » 09 Aug 2022, 15:11

It merely a thought at the moment but, I’ve bought an accident damaged TT for the interior for my own car which was a little shabby.
I essentially...

0 Replies

2581 Views

Last post by mike.g
09 Aug 2022, 15:11
Best insurance company for Modified T25

Last post by AlexDal « 03 Aug 2022, 00:09
Replies: 10
by Grogg » 06 Feb 2020, 14:29

Hello everyone,

I’ve recently had a Subaru conversion to a EJ20 N/A and my insurance is due shortly :(

I was wondering if anyone had any...

10 Replies

5968 Views

Last post by AlexDal
03 Aug 2022, 00:09
Bosch 0 460 494 187 diesel pump

Last post by ZsZ « 11 Jul 2022, 19:04
Replies: 3
by t25adict » 09 Jul 2022, 14:22

I am gradually going through parts I have collected over many years. I have found a Bosch 0 460 494 187 diesel pump that from what I remember came...

3 Replies

1745 Views

Last post by ZsZ
11 Jul 2022, 19:04
AAZ Timing belt kit

Last post by ajsimmo « 10 Jul 2022, 16:48
Replies: 2
by Al Housman » 10 Jul 2022, 11:24

I feel that my truck needs a new timing belt soon but two kits are listed, depending on engine number.
Does anyone know if there are major...

2 Replies

1669 Views

Last post by ajsimmo
10 Jul 2022, 16:48
subaru issue help needed

Last post by silverbullet « 08 Jul 2022, 20:09
Replies: 2
by kevindouglas4130 » 07 Jul 2022, 09:49

Hi Guys,

Im looking for some advise on an intermittent problem with my 86 Syncro, Subaru 2.5 swap.
Randomly it will lose power /choke while driving,...

2 Replies

1665 Views

Last post by silverbullet
08 Jul 2022, 20:09
Help identifying mount console for Injection Pump

Last post by siwalker93 « 25 Jun 2022, 13:37
Replies: 5
by siwalker93 » 22 Jun 2022, 13:30

I have an mTDI AFN with a Bosch VE pump from a 2.9 Kia Sedona. I'm looking for a specific pump bracket to run this set up and wondered if anyone had...

5 Replies

1965 Views

Last post by siwalker93
25 Jun 2022, 13:37
Mass Air Flow Sensor, which replacement?

Last post by rollercoaster « 10 Jun 2022, 20:16
Replies: 3
by rollercoaster » 08 Jun 2022, 19:47

Thought to ask, as theres a wide choice,
and price range,
and is it too simple to just say get the same?

My AGU motor felt like it was running out...

3 Replies

1729 Views

Last post by rollercoaster
10 Jun 2022, 20:16

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