Okay, as long as the shop has a crimping tool, I guess.

__________________
83 SD

84 CD

You have e-mail.

think of it this way. (no offense to the crutch explanation) when the chain begins to wear, cam (and by relation, injection pump)timing is retarded, as the chain wears, it minutely damages the gears as well. installing an offset key corrects the cam timing, but not the injection pump timing, AND the worn links continue to wear the gears.
a new chain solves BOTH the cam timing, and the injection pump timing, and it puts NEW surfaces on the gears slowing the wear!

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks Roy and vstech, a new timing chain WILL "re-time" the IP?

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83 SD

84 CD

Well, assuming the IP has not been "timed" since the chain was last replaced or new, then installing a new chain will correct the IP timing to when the previous chain was new. If that makes sense.

At least, that is how I understand it.

__________________
----Adam

1985 300SD 322,000

^ If that's the case, why doesn't an offset Woodruff key, if precise, do the same thing?

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83 SD

84 CD

Chain slop is not corrected by an offset Woodruff key..

A worn chain has a larger link center to center dimension = it is wearing the sprockets to match.

What is damaged by a worn out timing chain?

Crankshaft gear
MB# 617 052 00 03
$228.00

Camshaft gear
MB# 121 052 03 01
$252.00

sprocket gear
MB# 621 050 04 09
$127.00

Timing device
MB# 617 070 05 45
$615.00

Damage cost TOTAL $1,222.00
+ Labor

What is the serviceable life of a timing chain ? I finally got my hands on the complete maint records for my 85 300Sd ( it was my Dad's since new) Apparently it was replaced 154,234 miles and the car now has 199,950. on it.
I am going to post a few other items that appear to have been replaced quite frequently and so I am curious about them.
Alan

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )

Sorry, forgot to ask is it required and or part of the timing chain replacment to
check the IP timing ?

__________________
92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )

Thanks.

I'll add my "is there a certain stretch degree that would tell me to replace the chain?

And will that (thanks Beastie) get the fuel back to correct timing also?

__________________
83 SD

84 CD

You have e-mail.



Timing Chains Don't Last Forever
Timing Chains Don't Last Forever

NO.

Between 200-250K miles I replace the timing chain = don't waste time checking it..

If the timing has not been changed since new = it should be back where it belongs.

Thank you for being succinct.

__________________
83 SD

84 CD

hmm. the question this answers was, is there a stretch that says to replace the chain?
are you answering that no matter what the chain stretch is, replace the chain? or are you saying that it's pointless to check the injection timing, just change the chain, and the injection timing is ok?

with frequent oil changes, and synthetic oil, chain wear is drastically reduced, and could last much longer than 250K, so I'd think inspecting the cam timing marks would be good to see if a chain is needed.
also, some motors, like the one discussed above, need chain replacement sooner than 200K, again, oil type and change frequency would cause the failure, and measuring the stretch with the timing marks would tell this.
Yes?

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

If the chain is OLD, and the timing shows measurable stretch/wear = I replace it regardless of mileage!!!

Example is a retired W123 Euro police cruiser (Ohio owner).
* 113,000 total miles, (unknown hours idling).
* Lack of power/performance + poor MPG.
* Timing showed four degrees stretch/wear.
* Replaced the timing chain = perfect timing + great power.

If the engine has 200k +, and no records = I replace the timing chain, don't waste time checking it..