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#1
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3-4* timing chain stretch. FAQ's
I checked my timing chain stretch with the "cheater " method last night. I was too lazy to break out the dial indicator... I lined up the cam and cam tower timing marks, and the crank is off about 3-4*. What would ya'll do? It seems to me that this is within spec (coming from memory ), but I couldn't find a thread where it said. Thanks for your input...
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Regards, Ian White 1995 E300 Diesel w124 OM606 2014 E550 w212 M278 biturbo 2001 BMW 740i E38 M62 (past) 1981 300SD w126 OM617 (past) |
#2
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I would start thinking about replacing the chain if it were at 5 degrees, I wouldn't worry about it now, but thats only what i would do, a half dozen other folks will probably have have six other ideas.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#3
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Check it w/a dial gauge to make sure, but I would drive a vehicle another 200K with chain elongation between 3* and 4* - is this on the SD?
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327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron") 139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen") http://farm5.static.flickr.com/4081/...0bb92d3c_m.jpg http://i370.photobucket.com/albums/o...g?t=1325284354 Do not worry about your difficulties in Mathematics. I can assure you mine are still greater. - Albert Einstein take a walk down memory lane... |
#4
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Yeah it is for the SD, the engine is out of a 1984 300D with 256K. I am in the middle of replacing the engine (again).
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Regards, Ian White 1995 E300 Diesel w124 OM606 2014 E550 w212 M278 biturbo 2001 BMW 740i E38 M62 (past) 1981 300SD w126 OM617 (past) |
#5
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4 degrees is fine, donotworry one bit about it.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#6
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You're replacing an engine for the second time with an engine of substantial mileage unknown pedigree and actual condition, and your cursory examination shows at least 4 degrees cumulative wear elongation.
Not to sound like Mommy buy, penny wise, pound foolish? The best new chain IWIS cost about $100, sounds like cheap insurance that I’d gladly pay unless this Engine R&R stuff is a fetish for you! If you just don’t have or want to spend the coin I understand completely, I’m just making a risk vs. rewards devils advocate arguement. |
#7
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Just a thought.
Margin of error for the "cheater" method can have you well beyond the limit. Rolling in a new chain isn't all too hard, especially when you can rent a chain crimper from other forum members.
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine) Raleigh NC - Home of deep fried sushi! |
#8
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Ian,
You did not check the chain elongation.. so the rest of this thread is Moot.. except for the people who said it is better to just roll in a new chain... That is the safe thing to do if you are too lazy to actually check the elongation..... and possibly use the offset keys available for the intermediary stretch situations.
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#9
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The how...
Quote:
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Regards, Ian White 1995 E300 Diesel w124 OM606 2014 E550 w212 M278 biturbo 2001 BMW 740i E38 M62 (past) 1981 300SD w126 OM617 (past) |
#10
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I think MB FSM calls for replacement (or keys) at 7 degrees. When I bought my SD and had the dealer do an inspection and valve adjustment on it way back....it showed 11 degrees of stretch. Needless to say I had a new chain put in, it ran A LOT better after that. Since then I've done over 72k.....and it has not even stretched 1 degree yet. Probably due to my anal 4-5k synthetic oil change interval.
Side note: 11,000 posts!!!
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#11
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EEerggk!
When you replace the Chain,should not also the SPROCKETS be given some
consideration? I know,that Crankshaft sprocket requires R+R of the Timing Cover...
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'84 300SD sold 124.128 |
#12
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Usually the sprockets have little to no wear on them if the engine received proper oil changes......mine all still have production marks on them, brand new looking with 284k!
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#13
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Quote:
IF. it had regular oil changes. things are iffy when buying a used car, never know really what the prior maintenance was. When I bought the 85 back in 97, it had 176,000 miles on it. no documentation of any kind, so it is from that point I babied it and did the regular oil changes at every 3000 miles and so on. had the timing chain replaced at 269,000 miles as a preventative measure, didn`t really know what the streatch was at the time. I had the shop do the valve adjustment etc..... thinking this chain would take me onward towards the 500,000 miles I read about on e-bay . Then as in my sig, the timing chain broke with only 70,000 miles on it and the engine with 331,000. Picture what the Moon looks like, and eastern nevada looks similar. we are out in the middle of no-where, sort of. When we picked up the new engine from Metric Motors, Mike told me, even though the chain was replaced, the sprockets have wear on them, and wear into the new chain. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#14
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Quote:
Lots of discussion in the archives. Using the towers for trying to determine the chain elongation is not permitted according to the engineers who made your automobile. So using that method is akin to the old saying ' garbage in, garbage out' ... you have no useful information after that procedure.
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#15
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Quote:
__________________
1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
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