Front Diff

For 4x4 owners, you must register to post but anyone can read.

Moderators: Moderators, User administrators

Forum rules
You can find further syncro specific information on the Syncronauts website.
Post Reply
Masher_T
Posts: 18
Joined: 13 May 2020, 16:51
80-90 Mem No: 17166
Location: Leeds

Front Diff

Post by Masher_T »

Hi I am looking for advice please. I have 14” syncro with ej25 engine. I normally drive my Syncro on roads decoupled but after a chat with Aidan he recommended driving in 4wd. I took it for a blast around in 4wd and found that the cab was getting quite warm. When home The diff was v hot and there was a burning smell. Is this usually down to the VC or the Diff. I have emailed Holman Engineering to enquire about a refurb on my VC and am gonna change the oil on the diff and check the magnet but if I remove the VC should I bother changing the oil until I get it back.
Thanks


Sent from my iPhone using Tapatalk

User avatar
silverbullet
Trader
Posts: 12985
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Front Diff

Post by silverbullet »

How did it drive in 4wd? Do you have power steering (this can hide some symptoms)
I would put my money on the following:

1. wrong ratio front diff, which over-works the VC or
2. a very tight VC
3. both of the above.

What are the transaxle and diff codes?

Sent from my S60 using Tapatalk
85 syncro Caravelle twin slider Oettinger T3200E-6
90 SA Microbus supercharged wbx/UN1 project

http://www.025motorsport.com

User avatar
silverbullet
Trader
Posts: 12985
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Front Diff

Post by silverbullet »

I don't know your knowledge base, but for reference you'll find the 3-letter codes and serial number/date code stamped in these locations:
Front diff casing stamped on bottom at front, main transaxle casing on nearside (left) on lower angled face, helpfully painted yellow by Aidan when he rebuilt this one a few years ago ;)ImageImage

Sent from my S60 using Tapatalk
85 syncro Caravelle twin slider Oettinger T3200E-6
90 SA Microbus supercharged wbx/UN1 project

http://www.025motorsport.com

Masher_T
Posts: 18
Joined: 13 May 2020, 16:51
80-90 Mem No: 17166
Location: Leeds

Re: Front Diff

Post by Masher_T »

Thanks I will check the codes tomorrow. There is no power steering and it drove fine in 4wd no noises and at speed cornered ok went round a few roundabouts did not seam any different to 2wd just smell and heat. A few months ago I was in 2wd and lost all power a drive shaft had worked loose. I was only a couple of miles from home so I removed it and drove home fine in 4wd and then ordered and replaced all the bolts


Sent from my iPhone using Tapatalk

User avatar
silverbullet
Trader
Posts: 12985
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Front Diff

Post by silverbullet »

Sounds like a tight VC if it's unknown. Diff and gearbox do get quite warm when working (engine temp and more)
Could the hot smells be due to undeseal/stonechip or trail debris on on the diff?
Holman Eng Co/025Motorsport/silverbullet are interchangeable terms btw ;)

Sent from my S60 using Tapatalk
85 syncro Caravelle twin slider Oettinger T3200E-6
90 SA Microbus supercharged wbx/UN1 project

http://www.025motorsport.com

Masher_T
Posts: 18
Joined: 13 May 2020, 16:51
80-90 Mem No: 17166
Location: Leeds

Front Diff

Post by Masher_T »

I have already sent you an email and got a reply this morning. I will take it of and get it to you when I can. I want to do what I can myself so not sure how long but I don’t want it of the road long.


Sent from my iPhone using Tapatalk

Masher_T
Posts: 18
Joined: 13 May 2020, 16:51
80-90 Mem No: 17166
Location: Leeds

Re: Front Diff

Post by Masher_T »

Just checked the codes gearbox is 6PA1404. 7 and the front Diff is ADM 1565 7 are these compatible?


Sent from my iPhone using Tapatalk

Masher_T
Posts: 18
Joined: 13 May 2020, 16:51
80-90 Mem No: 17166
Location: Leeds

Re: Front Diff

Post by Masher_T »

Aidan, just let me know that the codes match and it’s probably original pairing. I will let you know when I am ready to send the VC
Cheers


Sent from my iPhone using Tapatalk

User avatar
silverbullet
Trader
Posts: 12985
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Front Diff

Post by silverbullet »

http://vwt3.com/t3-tech/t3-data/t3-gearbox-codes/" onclick="window.open(this.href);return false;

Sent from my S60 using Tapatalk
85 syncro Caravelle twin slider Oettinger T3200E-6
90 SA Microbus supercharged wbx/UN1 project

http://www.025motorsport.com

User avatar
silverbullet
Trader
Posts: 12985
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Front Diff

Post by silverbullet »

And from our very own wiki

http://syncronauts.org.uk/syncro-techni ... ront-diff/" onclick="window.open(this.href);return false;

complete with broken links... :(

Sent from my S60 using Tapatalk
85 syncro Caravelle twin slider Oettinger T3200E-6
90 SA Microbus supercharged wbx/UN1 project

http://www.025motorsport.com

User avatar
BeakerFlo
Posts: 23
Joined: 28 May 2013, 16:18
80-90 Mem No: 14656
Location: Alkmaar, NL
Contact:

Re: Front Diff

Post by BeakerFlo »

So they are both: 38:7 or ratio 5.43.
How is it with the oil in the front differential?

Tight VC can be checked with very short turns. Do wheels skip?
regards, Floris van Enter

VW T25 16" syncro with Subaru EJ25 engine and custom interior
beakerbus.nl

Timburrows
Posts: 270
Joined: 05 Jun 2014, 12:49
80-90 Mem No: 14187
Location: Shipton Under Wychwood

Re: Front Diff

Post by Timburrows »

I presume your tyres are less than 2 mm difference front to back?

Masher_T
Posts: 18
Joined: 13 May 2020, 16:51
80-90 Mem No: 17166
Location: Leeds

Re: Front Diff

Post by Masher_T »

The VC is tight gonna remove next week. On further investigation I was a bit of a numty.
I took it for another spin and it’s not the diff getting warm rather the heater staying on, also the bad smell was the near side brake binding which I have freed of before but has come back. I bought the vented discs and black diamond pads last year but still get brake squeal all the time. When I took it to brickie for a check up. I was told that pads might be a bit loose in the carriers. Is there an upgrade. Any suggestions. My job list is getting bigger VC, brakes and heater what next


Sent from my iPhone using Tapatalk

Syncrobaz
Posts: 797
Joined: 19 Jul 2010, 21:12
80-90 Mem No: 10610
Location: Wiltshire

Re: Front Diff

Post by Syncrobaz »

It's never ending mate, welcome to Syncro world ! You need a good sense of humour and deep pockets! :rofl
Syncronaut no 152
92 RHD mv panel van
94 RHD jx doka 16"

Post Reply