11 degrees of timing chain stretch operation - PeachParts Mercedes-Benz Forum

engatwork · #1 06-26-2006, 06:12 PM

I replaced the timing chain and tensioner in the '81 300D this weekend. Prior to replacing them there was 11 degrees difference showing (looking at the mark method) between the cam and crank timing marks. I am going to have to come back to the chain slide rail. Anyway, after changing it out there is a substantial improvement in the way the car starts. I used to have to give it some fuel to get it to crank and no longer have to do that

. I will probably be pulling this engine soon to replace the wear elements in the bottom end. Just thought I would share my experience running a car with 11 degrees of stretch. Oh yea - other than the starting issue the car ran out and idled fine.

Brian Carlton · #2 06-26-2006, 08:08 PM

Jim, how was the tensioning rail at 244K?

That is what would bother me the most.

engatwork · #3 06-26-2006, 09:05 PM

Based on a good visual inspection it is time to change the tensioning rail.

My plans are to pull the engine later this summer and go through the bottom end. I already have one engine with the block/head at the machine shop and need to finish that one before I start on another one.

leathermang · #4 06-26-2006, 09:21 PM

Where is your spirit of adventure ?
It is much more exciting to have all your projects completely apart at the same time... and on the same workbench adds another level to the challenge.

Ara T. · #5 06-26-2006, 10:05 PM

Keep me posted on any power or mpg improvements, that would be interesting to find out.

Brian Carlton · #6 06-26-2006, 10:27 PM

Quote:

Originally Posted by leathermang

It is much more exciting to have all your projects completely apart at the same time... and on the same workbench

.........got that a/c system torn apart yet on the 240D???.............

..........another summer coming............what's that.........the third without a/c??

sailor15015 · #7 06-26-2006, 10:41 PM

My wrecked 85's donor engine has about seven degrees of stretch using the same method of testing. It had a stumble on cold startup that I never could get rid off. I adjusted the valves, balanced/tested my injectors, did a diesel purge, ect. and it still missed when cold. The '84, which has about two degrees of stretch, fires right up, no stumble and I don't have to give it any extra fuel. I should have the 85's donor engine out in the next couple of weeks and I'm going to completely go over it, including the chain and rails.