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#1
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She's got the jitters, captain
Hello all. I have noticed a rough idle and a mild skip, lately that appears to show up after the engine warms up. Tailpipe smoke usually accompanies this - bluish. The fuel and air filters were replaced recently. I did a Diesel Purge at that time, too.
So, I set out to perform my annual valve adjustment and found all the exhaust valves tight and a few of the intake valves passable, but I loosened them up a little, anyway. I noticed no change in the rough idle/skip. Then, I continued in the diag process and loosened each of the injector lines - one at a time- to see if I could isolate the alleged cylinder. The engine responded to each of the injectors being loosened, so I wondered if injector balance could be the issue. I decided to perform a compression test while the injectors were out and found 420psi -across the board- on a warm engine. I put a set of used injectors from a spare engine in (not rebuilt or pop tested) and started the engine. The smoke is gone, but the rough-idle- while-hot issue still exists. I feel like I have accomplished a lot of maintenance tasks today, but I have not resolved the original concern. I am happy to see those compression numbers. Sooo...is my concern actually related to a rack dampener problem? Can a rack dampener cause a pseudo rough idle/near skipping hot idle concern? It smooths out above a 750 rpm idle. OR Is it an IP element/IP timing symptom?
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Thanks, Mark in NC "Spark plugs?...We don't need no stinking spark plugs!" 1985 300SD "Der Silberne Schlitten" 420,000 mi Wish these were diesel: 2003 Ford Club Wagon 130,000 mi |
#2
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Mark,
I dont know about the damper, but it is unlikely that its an IP timing problem. Element or DV is a possibility but its strange that it isnt just one. A check of the damper is probably a good idea. whats the timing chain tensioner like?
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#3
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Quote:
Adjust or replace the rack damper bolt.
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83 SD 84 CD |
#4
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Quote:
My understanding is that the 85's had a different design rack damper from earlier year models, right? Can they be adjusted? or Do you replace only?
__________________
Thanks, Mark in NC "Spark plugs?...We don't need no stinking spark plugs!" 1985 300SD "Der Silberne Schlitten" 420,000 mi Wish these were diesel: 2003 Ford Club Wagon 130,000 mi |
#5
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Ok. I just adjusted the rack damper and it has gone away ... for now. I will drive it and see how it does over night.
__________________
Thanks, Mark in NC "Spark plugs?...We don't need no stinking spark plugs!" 1985 300SD "Der Silberne Schlitten" 420,000 mi Wish these were diesel: 2003 Ford Club Wagon 130,000 mi |
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