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View Poll Results: How does the loosened oil cap on your warmed-up OM616/617 behave?
Just sits there. 27 23.68%
Moves around slightly. 48 42.11%
Dances around violently. 29 25.44%
Flies right off! 10 8.77%
Voters: 114. You may not vote on this poll

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  #16  
Old 11-14-2005, 05:51 PM
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Quote:
Originally Posted by Craig
82 300D Turbo
304K miles - head has never been off AFAIK
cap "moves around slightly" and blows small amount of oil onto valve cover.
With new exhaust valves and all new valve guides the SD does the same thing at 185K.

It will also blow a small amount of oil onto the valve cover.

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  #17  
Old 11-14-2005, 05:54 PM
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Quote:
Originally Posted by Craig
That explains a lot.
LMAO.
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  #18  
Old 11-14-2005, 05:54 PM
Craig
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Quote:
Originally Posted by Brian Carlton
With new exhaust valves and all new valve guides the SD does the same thing at 185K.

It will also blow a small amount of oil onto the valve cover.
I guess I can't complain for 300K, we'll see how it does at 400.
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  #19  
Old 11-14-2005, 06:06 PM
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Quote:
Originally Posted by Craig
I guess I can't complain for 300K, we'll see how it does at 400.
Are you going to go into it soon?

I understand that the timing chain guides and oil pump chain drive are on borrowed time at this mileage.

The tensioning rail on the SD had a groove about .06 deep. Nothing to worry about at this point, but, at 300K I'd bet that it was close to wearing through the lining.
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  #20  
Old 11-14-2005, 06:17 PM
Craig
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Quote:
Originally Posted by Brian Carlton
Are you going to go into it soon?

I understand that the timing chain guides and oil pump chain drive are on borrowed time at this mileage.

The tensioning rail on the SD had a groove about .06 deep. Nothing to worry about at this point, but, at 300K I'd bet that it was close to wearing through the lining.
I had the timing chain and guides replaced at about 200K (it was getting noisy). AFAIK, the oil pump chain drive has not been touched. At this point, it would make sense to do the entire head if I was going to pull it apart. Any way to tell if/when the oil pump chain drive needs attention? Should I be driving with one eye on the oil pressure gauge, more than usual that is?
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  #21  
Old 11-14-2005, 06:22 PM
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Quote:
Originally Posted by Craig
I had the timing chain and guides replaced at about 200K (it was getting noisy). AFAIK, the oil pump chain drive has not been touched. At this point, it would make sense to do the entire head if I was going to pull it apart. Any way to tell if/when the oil pump chain drive needs attention? Should I be driving with one eye on the oil pressure gauge, more than usual that is?
Talk with Jim Ellington on that. He's a strong supporter of replacing that chain and he can tell you how to identify a chain that needs attention. I don't think its a horrible job from underneath. But, he'd have the best advise regarding this.

If the chain drive fails, you won't have enough time, unless you were watching the gauge 24/7.

Doing the head and the top end won't avail you of the capability to do the oil pump chain drive.
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  #22  
Old 11-14-2005, 06:23 PM
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mine dosn't move at all, just hangs right with the engine, when removed and hand put over filler hole, no pressure builds, so i think i'm in pretty good shape @ 191900k
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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion
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  #23  
Old 11-14-2005, 06:35 PM
Craig
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Quote:
Originally Posted by Brian Carlton
Talk with Jim Ellington on that. He's a strong supporter of replacing that chain and he can tell you how to identify a chain that needs attention. I don't think its a horrible job from underneath. But, he'd have the best advise regarding this.
I didn't know you could get to it from the bottom with the engine in the car. That doesn't sound to bad. I don't know if/when the pan's been off. It might be worth it just to clean out the pan. Might increase my oil capacity by a quart.
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  #24  
Old 11-14-2005, 06:47 PM
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To check blowby

Don't I need to plug the line that goes into the air cleaner while watching the oil filler cap? Otherwise a portion of the potential blowby would go into the line?
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1987 300TD, 168K
1981 300D 220K
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  #25  
Old 11-14-2005, 06:53 PM
Craig
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Quote:
Originally Posted by sophie2
Don't I need to plug the line that goes into the air cleaner while watching the oil filler cap? Otherwise a portion of the potential blowby would go into the line?
Checking the cap with the vent line in place is a reasonable way to check for excessive blowby. If you block the vent, I would expect that everyones cap will bounce around quite a bit. Some amount of blowby is expected.
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  #26  
Old 11-14-2005, 06:53 PM
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Quote:
Originally Posted by Craig
I didn't know you could get to it from the bottom with the engine in the car. That doesn't sound to bad. I don't know if/when the pan's been off. It might be worth it just to clean out the pan. Might increase my oil capacity by a quart.
Looking in the FSM, changing the pump is not too bad. But, to replace the chain, you need access from the front and the manual states to remove the front cylinder housing cover. This sits right above the crankshaft on the front of the engine, so there would be quite a bit of work to remove everything in that location.

They don't permit a chain with a connecting link.
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  #27  
Old 11-14-2005, 06:58 PM
Craig
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Quote:
Originally Posted by Brian Carlton
Looking in the FSM, changing the pump is not too bad. But, to replace the chain, you need access from the front and the manual states to remove the front cylinder housing cover. This sits right above the crankshaft on the front of the engine, so there would be quite a bit of work to remove everything in that location.

They don't permit a chain with a connecting link.
Ouch, that sounds like a bit of a PITA. Do these things have a history of braking without warning? Having this fail on the highway sounds ..... inconvenient.
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  #28  
Old 11-14-2005, 07:04 PM
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Quote:
Originally Posted by Craig
Ouch, that sounds like a bit of a PITA. Do these things have a history of braking without warning? Having this fail on the highway sounds ..... inconvenient.
I don't believe that they do. But, Jim's comments on the condition of the chain and the drive would lead one to believe otherwise.

Maybe they go a very long time with tolerances way out of the original manufacturing spec, like most other things on this engine.
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  #29  
Old 11-14-2005, 07:11 PM
Craig
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Quote:
Originally Posted by Brian Carlton
I don't believe that they do. But, Jim's comments on the condition of the chain and the drive would lead one to believe otherwise.

Maybe they go a very long time with tolerances way out of the original manufacturing spec, like most other things on this engine.
Thanks, I'll have to check with Jim and I'll add this to my list of stuff to worry about.
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  #30  
Old 11-14-2005, 07:56 PM
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Quote:
Originally Posted by Craig
Thanks, I'll have to check with Jim and I'll add this to my list of stuff to worry about.
LMK what he says about it. He's taken apart a few 617's and was rather shocked at the condition of the chain and the drive, IIRC.

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