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#1
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What parts do I need?
When replacing a timing chain what parts should be replaced? Just the chain and tensioner? Or is there other stuff that should be replaced at the same time? This is on an 85 300D turbo.
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k |
#2
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I did my timing chain about a year ago on my '83 240D.
I replaced the following: - Timing chain - chain tensioner with new gasket - 4 slide rails (tensioner rail, upper & lower rails, clamp rail) - camshaft sprocket - idler gear The slide rails are plastic and will wear down over time. It's probably reasonable to assume that their intended lifespan is about the same as that of the chain. You may also replace the crankshaft sprocket, but that's a little more involved. I had problems getting the bearing pin out for the tensioner slide rail. It helps if you have the recommended tool (i.e. the bearing pin impact puller). I didn't, so I jerry-rigged a tool that worked for all the other bearing pins but failed miserably for the tensioner slide rail bearing pin - the bolt broke off in the pin. So, I'm actually just now replacing the tensioner slide rail and crankshaft sprocket while I'm rebuilding the whole engine. - Nathan '83 240D, 255k miles '00 New Beetle TDI, 28k miles |
#3
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It never hurts to replace everything. But, actually if the engine has had regular oil changes and you don't see any broken parts visible, or worn teeth on the camshaft sprocket, roll in a new chain and you'll be in good shape. There is nothing to really go wrong with the tensioner.
Good luck, |
#4
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Thanks for the reply, I think I'll just put in a new chain and tensioner unless something else looks worn. I'm not even sure I need to replace the chain, just being cautious, it has 140,000 on it and the oil has always been changed at least every 5k. I figure it is better to spend a couple hundred now than wait and spend a couple thousand if the chain breaks.
__________________
1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k |
#5
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When you refer to "tensioner" do you mean the plunger mechanism or the tensioner rail?
The tensioner mechanism itself does not need to be replaced. Unless something weird were to happen, you could run the tensioner two million miles. The tensioner RAIL, on the other hand, could be worn, in which case it MIGHT be worth replacing. But, it's your money, and you need to replace what gives you peace of mind. Good luck, |
#6
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You may be able to see the tensioner rail while you're changing the chain. Mine was grooved pretty badly. It's just made out of rubber, and the tensioner presses it right against the chain so it wears down over time. I don't think it can ever wear to the point where it breaks, though...
- Nathan '83 240D, 255k miles |
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