My low compression discussion thread will be replaced by a head R&R thread as I seek the expert's advice on my motor's innards.

Head's off, so I'm replacing the chain tensioner rail just because. Please take a look and see if you can answer a few questions:

1. Does the bearing bolt appear to be reusable? The wear is significant.. about .005" at the most. I'm guessing probably not good. So maybe my real question is, anyone know who sells these?


2. How many miles do you think this timing chain rail has on it? I had a shop replace the timing chain @250k, they were supposed to do the rail too. Think they did?

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'82 300SD 351k

Additionally.. that lower tensioner pin was a bear to get out. Impact puller failed, special threaded puller failed, ended up having to pull the front crank seal cover and make up my own puller.



Attention! If the $#%^ bearing bolt is stuck so well it busts up the special tool, make a bigger special tool. And pull the crankcase cover so you don't need a recess.

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'82 300SD 351k

Those pins are tricky to get out but usually can be reused. I think the first one I pulled on my 62 finny I used a thermostat housing bolt and a bunch of washers!

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

If you can figure out what side the worn side was facing you can turn it 180 degrees and install it. That way it will have a fresh surface to wear on.

You might simply ask the Dealer how much one costs. I bet they have had some in stock for a very very long time and never sold any.

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84 300D, 82 Volvo 244Gl Diesel

See if the old one even fits into the bore of the new tension rail. It doesn't look like it is the same bore, so there should be a new one available with the new rail.

Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

Just checked, they're both the same bore - I dropped some pin gauges in, the old one is .316" and the new one is .315".


I think this pin gave me so much trouble because there was a little bit of rust around the edge near the surface of the block. The first puller I had used a 8.8 M8x1.25 bolt and washers.. it broke the bolt. The second one was a 12.9 M8 stud threaded into the end of a 3/4" bolt, in 4130 tubing, with a 1/4" washer backing up the nut.

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'82 300SD 351k

True but that doesn't often reflect in the price more's the pity

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

All set, found one used.

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'82 300SD 351k

Actually I was trying to indicate they might sell it cheap just to get rid of the part. Parts sitting on the shelf for long periods are a waste of money not accruing any interest.

As sort of an example: I had an old 1957 BSA A10 Motorcycle. While I had it apart I managed to lose the what I will call Crank Case Breather Valve.

There was a local shop that specialized in old English Bikes. He had a lot of new old stock and used parts.

When I ask him if he had a breather and how much it costs he pulled out a rather large box full of Crankcase Breather Valves and just gave it to me for free. He said he had never sold or even had any one ask for one.

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84 300D, 82 Volvo 244Gl Diesel