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#136
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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily 1992 Mercedes 300D 2.5 202,000 - Pure junk 2000 Mercedes E320 Black - 136,000 miles - Needs repair Don't forget to grease the screw and threads on the spring compressor. |
#137
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Valve job requires head removal for certain. If your head is clean and warp-free like mine was (I got REALLY lucky), it is worth rebuilding. If it is warped, cracked, or looks like something dredged from Titanic, seek out a #17 or later head and have IT rebuilt for you. New guides, valves and seats ground, and a good solvent wash to clean the sludge out of the oil galleries. After that, treat it to new lifters and you'll have a top-end that's like new.
My engine had worn out valve guides. The originals were iron and do not have a long life expectancy. All 12 were worn to the point that the valves were "wiggly". The machinist I took my head to for rebuild was absolutely shocked that I was still getting 350+ PSI compression out of it like that. When I tried a leak-down test, #6 was leaking by the exhaust so badly that I couldn't even get pressure in the cylinder! |
#138
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It's possible that someone could have replaced the chain before. I suspect that has happened in my car. I have right at 1˚ of timing chain stretch which seems implausibly low at my mileage (the odo says 179K, the body and drivetrain say that ODO didn't work for a LONG time...). |
#139
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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily 1992 Mercedes 300D 2.5 202,000 - Pure junk 2000 Mercedes E320 Black - 136,000 miles - Needs repair Don't forget to grease the screw and threads on the spring compressor. |
#140
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Diseasel300, surprised with the iron valve guides, did Mercedes use that in the 617 engines also?
Father Of Giants, you've done a lot and learned a lot with this car. Great job! You've had great help!
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#141
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If you pull the head to have it rebuilt, order a head gasket kit and new head bolts while you have it in the shop. You will need a copy of the FSM for removal and installation of the head, there's a specific order to go in to prevent warpage and a specific tightening sequence that requires some herculean strength and a cheater bar. Before taking the head off, make sure your leakage/problems are coming from the head/top-end. A leak-down test (even if not perfectly performed) will tell you where the air is escaping. If it's coming out the crankcase, it isn't worth doing the top end. If you hear the air coming out of either manifold or through the coolant overflow bottle, get after it. When I originally got my car, I had ~320 PSI compression on #4 and #6. Post rebuild, I'm >390 on both. My last compression test was this past winter not long after the car went back on the road, and the car runs better now than it did then, so I'd estimate the compression is probably >400PSI now on all cylinders since it's had time to break itself in now. |
#142
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If the 617's do have iron valve guides, I'd expect them to be better suited to the task since the 617 uses rocker arms to actuate the valves instead of a hydraulic bucket tappet directly acting on the valve stem. |
#143
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Only diesels in this driveway. 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
#144
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#145
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Don't rebuild your cylinder head. Buy a used cylinder head, have that one rebuilt, and then you can swap yours out inside of a day, without waiting on the machine shop.
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1998 E300 turbodiesel America's Rights and Freedoms Are Not The Enemy! |
#146
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So many people have trouble with the bold part though. The thought of how can I do this *properly* never crosses their mind. Priority 1 is how can I do this the *absolute cheapest* way possible.
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1998 E300 turbodiesel America's Rights and Freedoms Are Not The Enemy! |
#147
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I've got a decent used head that I pulled off a 3.5 liter motor (unknown mileage), it's a #20 casting. One issue you'd have is that this head has oblique injection, so different injectors than what your car has if your head is original, and I don't have a spare set of injectors for it. Contact me off list if you are interested. I really need to get it tested for cracks, probably time to do that.
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Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC |
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