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#1
03-16-2004, 01:53 PM
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How do you diagnose worn IP
I'm concerned about my diesel. She doesn't feel right.
The sound of the engine at idle is a little harsher than I remember it and the engine seems to shake a little differently, not the usual harmonic. There also seems to be a distant thump sound in the engine especially when hot after a hard run. These changes are mostly sublte, but I've been driving the car forever so I a) am too close to notice a difference and/or b) should know how it's supposed to be. I'm going to have my mechanic perform a compression and leak test if necessary. Engine has 300,000 miles New chain, filters, IP timing correct How do you diagnose a worn IP?
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63 220S W111 76 300D W115 2013 VW JSW TDI M6 previously- 73 280 SEL 4.5 86 300E 5 speed 2010 VW Jetta TDI M6 
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#4
03-16-2004, 03:44 PM
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I have looked at the shop manual on this... and I think most will agree that you need to find a GOOD fuel injection place ( which may mean mailing it off ) to do this service or check...
However , I think the probabiliy that this is what is causing your symptoms is slight compared to the other more obvious things which can go wrong... and they are easier to fix also...
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#5
03-16-2004, 04:58 PM
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Things I haven't touched in ages like pre-chambers or some of the injectors?
Valve job? Head has not been off for 300,000 miles. Thanks
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63 220S W111 76 300D W115 2013 VW JSW TDI M6 previously- 73 280 SEL 4.5 86 300E 5 speed 2010 VW Jetta TDI M6
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#6
03-16-2004, 05:29 PM
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Yes, exactly....
By filter you mean you have also checked the screen inside the fuel tank ?
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#8
03-16-2004, 07:04 PM
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Ok,, just remembered something else from the manual... Did you know that a new chain will stretch more than an old one in the same number of miles ? You might want to check your IP timing again just to be sure of it... before you continue....since you have a new chain ( but I assume on an old sprocket ...which makes it wear even more )...
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#9
03-16-2004, 07:33 PM
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New sprocket on cam only.
It is due for a valve adjustment but it is right on time, not late but maybe the adjusters are not holding their position these days, or cam is worn. I guess these would be preferrable to worn IP Motor and tranny mount are only a couple of years old. I'll check chain stretch. Definitely haven't checked the screen inside the fuel tank. 
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63 220S W111 76 300D W115 2013 VW JSW TDI M6 previously- 73 280 SEL 4.5 86 300E 5 speed 2010 VW Jetta TDI M6
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#10
03-16-2004, 09:30 PM
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As a reminder...Since there IS a performance complaint.... the Shop Manual requires that you check the chain stretch by the ' opening of the number one intake valve' method.....
I also believe this will spotlight a worn cam ramp....
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#12
03-17-2004, 03:28 PM
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The IP almost never wears out unless it had lubrication failure. They can get out of calibration but that usually means low fuel delivery, and low power. Most of the time the problem is not the IP. It is MUCH more likely to be injectors, especially if they are original! Wouldn't hurt to try a Diesel Purge treatment, and of course a steady diet of Italian tune-ups.
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#13
03-17-2004, 08:50 PM
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Compression test or leak down test is throwing your money away. Most of the time, these are done incorrectly and the results mean almost nothing. There are easier ways to find a dead cylinder, if that's what you have, and I doubt that's your problem.
As was previously mentioned, your IP is probably fine....they don't fail very often and this does not sound like their failure mode. If, and only if, you have gone more than 150kmiles on the injectors, I would pull them and bring them to a diesel fuel injection shop and have them checked out. They should charge you about $5 each to test them. And save your money on the diesel purge...IMHO, another high tech snake oil that might work in some cases but if your injectors are right, totally unnecessary. And forget the Italian tuneups. It works when everything is perfect with the car but the engine is a bit loaded up by being babied about town. Most of the time there is something wrong causing your symptom which after repaired, normal driving gets the car back in shape. All, IMHO, of course. 240Joe
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#14
03-17-2004, 09:50 PM
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Two of the injectors are circa 1984 with the engine rebuild. Three were replaced maybe about 100,000 miles previous by the dealer.
Normally all are replaced yes, but they tested them all and saw that I was fiscally challenged at the time. I've run redline almost religiously and the car gets regular highway use. There is no nailing whatsoever. It may be tight valves. I will do a valve adjustment, but maybe the adjusters aren't holding their positions for long. It could have something to do with the fact that this other mechanic I used to use, put the cam gear on backwards with the chain one tooth off TDC. I ran the car that way for a while making myself nuts trying to figure out what that wierd noise was (possible ever so slight valve piston contact noise)  Finally got it figured out thanks to this site and corrected it and the car seemed to run fine after that. Only recently has the fuel comsuption gone up with increased smokiness at idle. There is also a possible fuel leak, I smell it occasionally. I will now duck under my computer and await the incredulous reactions for with holding this info so far.:p
__________________
63 220S W111 76 300D W115 2013 VW JSW TDI M6 previously- 73 280 SEL 4.5 86 300E 5 speed 2010 VW Jetta TDI M6
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#15
03-17-2004, 10:22 PM
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Quote:
Is the 393K miles on your engine the total from new or total from the date of the rebuild?
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 
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