Need some help identifying which chain parts I need???

[Trickygti 3]

So I've got a bit of a timing issue with my engine so I thought I'd get it stripped down tonight, set the timing, and rebuild tomorrow with new bolts for the chain cover. Here's were it went pear shaped!

Removed the top cover and found the upper chain tensioner guide wasn't straight? Also the tensioner itself wasn't flat on the end which I thought it should be?

(excuse the crap iphone pics)

Now the car is a 96 OBD 2 model and according to the engine number stamped on the block it's an OBD 2 block but as you can see its got a twin chain head, so is that an OBD1 head on an OBD 2 block? If so which chain tensioner and guide do I need as it looks like an OBD2 guide with an OBD1 tensioner?

The part number on the tensioner is

The engine number is 240420

Any help would be great as I'm towing the car to work tomorrow to start removing the gearbox and replace the damaged parts.

[Lukey. 381]

You're right, its an older tensioner bolt and newer guide, at the very least you've got old cams and intermediate sprocket to accommodate the twin chain.

[Trickygti 3]

It's got Autotech 262 cams fitted with what I assume are early sprockets. I assume cams aren't OBD specific?

Also does anyone know if it's got the right cam sensor pickup fitted to the sprocket? I've found a picture of an OBD2 chain setup on google but the cam sensor pickup wheel has about 4 cut outs on it. Has anyone got any pictures of their cars stripped down?

arrrrgh my brain is fried tonight trying to work this damned engine out

[Lukey. 381]

That's what I meant all of the sprockets, the iPhone has a habit of changing your sentences lol

Are you looking at mk4 12v pics from a US source?

Mk3 looks like this, the ml4 one is "cross" shaped.

[Trickygti 3]

Ah thats great cheers for that, yeah it must have been a US spec picture I was looking at. Thats great, so I can still fit a later tensioner and tensioner guide to a duplex chain head? Think I'm getting somewhere now

[UnitedMotorsport 55]

The engine has been put together with the wrong tensioner bolt - that has caused the upper tensioner blade to twist.

The 4 cut out cam trigger is from an extremely late OBD2 and depends on ECU code. I have NEVER seen one in a Golf/Corrado.

The upper tensioner blade and bolt from the AMY engine can be fitted to the earlier duplex chained engines.

[Lukey. 381]

The AMY engine just uses the later type guide and bolt for the AAA.

That is;

021 109 507 B - Late bolt

021 109 509 E - Late rail

Or if you want to make it single chain like it should be;

021 109 503 F - Single upper chain

066 109 570 - Single intermediate sprocket

021 109 111 H - Single cam sprocket (need 2)

N 102 038 03 - Cam sprocket bolt (need 2)

If you're going to take the opportunity to renew the rear crankshaft seal while the box is off its about 50 quid from VW, ring a motor factors and get an Elring p/n 342.093. Its about 15 quid.

[Trickygti 3]

Thank you so much for your help guys, I'll get the parts ordered from TPS tomorrow and get the box off friday night/saturday morning. Just towed the car up to work so I can crack on with it with some proper tools and a ramp.

[VR6Pete 1,455]

Good luck mate. Keep us updated with progress

[Trickygti 3]

I will do Pete, I'm itching to get the gearbox off now and get it sorted, gonna give the gearbox and a few other bits a lick of paint before they go back in too. I'll drag this thing kicking and screaming into next years show and shines if it kills me