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Reringing while replacing the head good or bad?
I'm slowly gathering parts to replace my cylinder head on my 85 300d to find the source of a knock coming from the head.
I was wondering if I could slip out the pistons and replace the rings without getting uneven compression. The bottom end is new but I never touched the pistons before. I don't have the money or time to replace the sleeves, so it would be half a rebuild. Compression is fair and the motor is seating at about 160k. Also, how hard is it to replace the wrist pins. .
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 Last edited by whunter; 02-03-2014 at 09:26 PM. Reason: spelling readability |
#2
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Anything in the block below the head will need the engine removed to replace it. The only thing I can think of in the head that would make a knocking sound is the valve guides slipping down in the head (had it happen once), or injector nailing (no need to remove the head to fix).
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#3
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to answer your question... maybe.
new rings IF THE CYLINDER IS NOT WORN can improve compression... but odds are good if the rings are bad, the pistons are bad... new rings won't fix bad pistons...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#4
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I'm thinking its a wrist pin honestly.
The noise is worst at cold start, better when warm and sometimes gone after getting off the freeway. Changes pitch depending on if I let it warm up or if I just take off. I'm wanting to get in there and see if the piston is lose. From the bottom half everything looks great. I've rebuilt injectors and timed the pump. Starts when 10 below. No one can figure it out. .
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 Last edited by whunter; 02-03-2014 at 09:34 PM. Reason: readability |
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I was reading this manual a member showed me that showed that the lower pan can be removed in the car if the motor is lifted slightly. Really don't want to try it if I don't have to.
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 |
#6
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No need to lift anything to remove the lower pan, it's the upper pan that needs the engine removed in order to remove/replace.
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#7
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Here are some other facts I've put together. The lower oil pan looks to have been replaced. The motor came out of an junk yard car that set for god knows how long, at least 5 years. The crank case breather was capped and driven like that for a few miles before dying, owner thought the rings were shot and sold me the car. The motor is easier to turn by hand until one of the pistons hit the top of its stroke, unknown which, and then requires more effort and I hear a very small clack.
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 |
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I'll post a video and a picture of my new head later for kicks and giggles.
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 |
#9
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I have done a "ring job" w/ engine in car in several gas motors (Chrysler 2.4L & 383), but wouldn't try it on my 300D. I disassembled one of my 300D engines on a stand, and thought it would be almost impossible to re-ring it in the car. I think a few people have removed the upper oil pan in the car, but it was probably harder than removing the engine. You might be able to replace only the #1 connecting rod bearing thru the lower oil pan opening. Look at photos here.
I suspect that better than a simple hone & re-ring, you would do better to replace the cylinder liners first. I have done that (see my post). However, that requires then taking it to a machine shop to deck the block and bore/hone (haven't done yet). |
#10
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Did you take a compression test? Did it indicate low compression? if the engine truly has a hundred sixty thou miles it is very unlikely to be a problem in the bottom end....the top end either for that matter. have you checked the vacuum pump?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. Last edited by whunter; 02-03-2014 at 09:30 PM. Reason: spelling |
#11
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Quote:
If every rev you probably have something in a cylinder. As the piston rises the object hits the head. If every other, you have a valve sticking or something on a piston just below a valve. Pull the valve cover and see if you can coordinate valve action to the sticking. ( Turn the engine just until it gets tight, see if any rocker arms have lots of lash. ) |
#12
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Answer
Quote:
* Cold injector nailing. * Fuel delivery (to the injection pump body) pressure LOW. * Seriously bad fuel quality. Injector + Heat shield + Nozzle, Prechamber + Collar, and Nailing. LINK THREAD http://www.peachparts.com/shopforum/diesel-discussion/211750-injector-heat-shield-nozzle-prechamber-collar-nailing-link-thread.html Diesel Fuel Delivery: http://www.peachparts.com/shopforum/diy-links-parts-category/142399-fuel-delivery.html Fuel pressure problem solved '80 300SD http://www.peachparts.com/shopforum/diesel-discussion/333779-fuel-pressure-problem-solved-80-300sd.html Strong nailing Strong nailing - PeachParts Mercedes ShopForum Fuel injection pump starvation with a good lift pump Fuel injection pump starvation with a good lift pump - PeachParts Mercedes ShopForum Fuel pressure relief valve adjustment Fuel pressure relief valve adjustment - PeachParts Mercedes ShopForum lift pump test 1979 300td -- Can anybody walk me through a lift pump test? - PeachParts Mercedes ShopForum fuel pressure fuel pressure - PeachParts Mercedes ShopForum great internal injection pump pictures http://www.peachparts.com/shopforum/diesel-discussion/300531-injection-pump-sluggish.html#post2738138 .
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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