Hello,

Finally bringing my 91 back to life with a donor 90 602 engine.
Both engines and transmissions are pulled and the 90 engine is on a a stand.
I want to not only replace the timing chain but the three guides as well.
The factory procedure assumes the engine is in the car and the chain is being fed arround.
What I am uncertain about is the procedure to access the bottom guides .

In a nutshell can the lower guides be replaced ( the timing cover removed) without the IP timing gear being removed. I removed a IP from a junk block and the peices that fell out of the IP timing gear were many and I was real glad I wasnt putting that back to together. ( I do not have the Mercedes basket tool )


The 90 engine has 206 K miles on it. It has a Iwis chain on it which I am assuming is the original ( if in fact Iwis is original equipment) as I have no Invoices to reflect otherwise. The timing marks line up perfectly but while I have it out at this mileage I want to be as thourough as possible.

Additionaly I would like to replace the oil pump chain and guide.

Thankyou

Pull the front cover to replace all the guides. Make sure you do oil pump chain guide and tensioner while it is off.

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Jim

Thankyou,

Please clarify, are you stating that I should replace the oil pump itself as well as its chain and guide ( and does it have its own tensioner as well that should be replaced )

and

I am then to understand that the front cover comes off without removing the IP timing gear assy ?

also,

I cannnot find a listing on Pelican for the oil pan gasket shoud I just use form a gasket ?

lastly,

toying with the idea of doing the rear main although it is not leaking... is this a can of worms ... I see there is a repair size of the this seal listed on pelican ... is there often housing or crank groove wear that necessitates a change of position ? - the repair/oversize seal is 1mm one wider not sure what this entails.

thankyou

Replacing the rear main seal is easy if the motor is out, remove the old one and see if you have a groove on the shaft. I had a small groove on mine but I just put the new seal in a little deeper. You will see what I mean.

Thankyou

Don't replace oil pump. Once you remove the vac pump you will see you don't have to remove timing drive gear to remove the front cover.
Do the rear main. It is no harder than replacing timing chain/guides.

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Jim

Thankyou,

I will do accordingly and thanks for replying on my other thread

Chris