Ouch!

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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.

Ok my 1st thing to do would be to secure a prechamber pulling tool along with tool to get the lock nut off the top. If I could make one or borrow one I can start pulling the chambers. My question is lets say a part of the prechamber blew apart and is laying on top of the piston if I pull the prechamber out would I be able to vacuum the lose piece of metal out put a new prechamber in and be good to go or would I have a loss of compression if my piston looked like some of mach 4's. Not clear on how to make the pulling tool. I will keep reading. Hope I can get this car going again soon.

The prechamber pulling tool can be made from a bicycle crank removal tool. (Search eBay for "bicycle crank tool" - they're well under $10) All you care about is the section that screws into the crank - it has the same threads as the prechamber. Weld on a nut with the same thread as your slide hammer. (I broke my cheap HF one so just went to the local auto supply store and borrowed the one in their tool lending library)

The collar removal tool is a bit more complex. It's built from an old 7/8 socket and the bottom end of an old injector. Cut the bottom of the injector off and weld in a nut. Cut the end of the socket with a grinder to form the tangs that go in the prechamber collar and weld on something you can grab with a wrench (I used an old spark plug socket - who needs spark plugs anyway ). Note: you'll need to modify to profile of the tangs a bit to properly sit down and engage the collar fully. To use, you screw the injector bottom into the prechamber, insert the modified socket onto the collar engaging the grooves, screw on the bolt to hold alignment and proper engagement, and unscrew the collar. If you ask "why can't I just use the modified 7/8 socket directly", just try and your answer will be self-evident.



Good luck.

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

The prechamber ball shrapnel were welded to the top of the piston - that would take quite a vacuum to remove those

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

Great instructions mach4! I should make myself a set in case I need to pull my prechambers. Do all bicycle crank tools have the same threads (the one that matters)?

Will either one of these do?
New Bike Bicycle Cycle Crank Wheel Puller Remover Repair Extractor Tool Mountain - US$5.36

New Bike Bicycle Crank Puller Remover Removal Wrench Handle Repair Tool - US$4.49

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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

Yes, those are fine.

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

Talking about using the power steering shaft nut to rotate the engine....

It has the potential for ruining your power steering pulley or the shaft or both..
an unnecessary chance to take...

The FSM says to use the front of the crank to rotate the engine.

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Sorry to hear about your difficulties Don! I know how hard you try to keep the Benz going and it has done great for you. Look at the years of transportation you have gotten on very low cost grease. My opinion is that your SD is quite tired and now this is the second engine you have lost in short order. Do yourself a treat, upgrade to a new beautiful body and there are plenty still around, put in that great engine you got from me, transfer the whole of your grease apparatus, and take whatever of value out of the old SD, rear axles, transmission, radiator and oil cooler, what ever is of value to you, and junk it out. Your suspension on that SD is really tired along with this engine and I think it is time to make a big change.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!

Somewhere in the archives the actual threads are listed... I think by JABAJ007 but not sure of his screen name...
Diesel911 posted this a while back
"""The Prechamber has different threads for the puller that you would use the Slide Hammer on.

The threads inside of the Prechamber are M22-1.0 for the Puller.

The threads on the Injector and the inside of the Prechamber Retaining Ring are
M24-2.0
"""

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

Just read a couple of the replies now you are a great bunch of guys with all the advice. Mach4 those are very good instructions for how to make the 2 special tools to remove prechamber locking ring and prechamber itself. I spent all day yesterday trying to figure out how to make those and wound up just buying 2 tools at a cost of about $110 and I will have to get a cheapo slide hammer yet that hopefully I can bolt unto if it has 12mm threads if I cant find one I'll need an adapter I suppose cause I'd rather not have to weld slide hammer onto tool. You made a good point mach that the broken up prechamber could be welded to top of piston if that is the case that just replaceing the prechamber will do me no good. Yes Jim maybe it is time for a big change I might just drop that fine motor I got off you in this vehicle and Ill have 2 parts motors. As of right now I am waiting for my 2 tools to arrive so I can pull the prechamber I am not so optimistic that this motor will run again might be doing a transplant shortly. On doing research I have read many people have had this occur with this motor I just never knew about it and it caught me by surprise. Will post pictures of prechamber when I get it pulled hope the tools come shortly.