Diesel Engine Specific Aid

1982 300 td Radiator Neck Failure

Well sure enough, my very clean and tight TD's radiator neck failed while driving and I am glad I am an assiduous gauge checker. When the temp started heading up above 100 I pulled off the road and found the hose off and quite a mess. There was enough of the neck remaining for me to reattach the hose and make my way home.

I am wondering if I can use the reinforcement kit and a piece of ABS or some such to fashion a new radiator neck instead of buying a new radiator. I'd much rather spend that money on replacing the rear window gasket of the CD.

Thanks for your help.

Chassis Model Number

W123

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Diesel Engine Specific Aid

electric fuel pump added to my 1984 300 CD

1984 300 CD
I added a Mercedes Source electric fuel pump, no other fuel system mods. After inital installation the pump would audibly cycle slowly at idle, and pump speed would aduibly increase with engine speed.

suddenly, the pump now runs at high speed constantly, idle or at highway cruise, no detectable difference. Is this a problem or normal?

Also, any ideas of a material to use to isolate the pump from the chassis to lower the audible pumping sounds?

Chassis Model Number

W123

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Diesel Engine Specific Aid

1985 300TD Turbodiesel - Boost Intercooler - Any Experience?

My 1985 300TD Turbodiesel runs on SVO. The car has good compression and runs great. The car gets to 60mph in about 13s which I believe is to be what's expected from a well tuned specimen. My aim now is to improve the performance beyond that. I have installed some of the performance-enhancing modifications recommended on this web site, including Monark injectors and a fuel boost pump. (Of course I also have Kent's performance tuning manual which has been very useful;-)

Chassis Model Number

W123

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Diesel Engine Specific Aid

1980 300SD Oil Consumption

Oil consumption has appeared as an issue following the Christmas holidays. During this 2 week period, I drove very little. Following the holidays, I found oil consumption to be high. Initially 1.5 qts in the first 150 miles! Next oil top-off showed consumption down to 1.0 qt in same distance. Currrently, oil consumption has recovered to the historic 1 qt. per 1500 miles. Rear of car has oil mist grunge so I suspect it was going out tailpipe. No new external oil leaks. I suspect valve seals or a turbo seal though turbo boost has remained unchanged (max P and boost response). Comments?

Chassis Model Number

W116

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Diesel Engine Specific Aid

1984 300D Cruise control issues

Hi all. Hope the New year is being good to everybody. I work this site for all I can and have read every question that pertains to my particular car and have gained so much knowledge. I am grateful to Mercedessource for providing this great data base. That said my question is, that if I set my CC at about 62 mph and around 3000 rpm it works fairly consistant. I say "fairly consistant" as eventually it gets a little jerky. If I don't set it right around those values it runs even more jerky. It surges and then backs off again and again as it tries to compensate for rises and dips in the highway. I have read about the amplifier under the dash and loose ball sockets in the linkages. Has anyone had similar symptons and addressed this specific quirk and what was your experience and outcome.

Chassis Model Number

W123

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Diesel Engine Specific Aid

85 300TD rear main seal...what else to do?

I changed to 5W-40 synthetic and am now leaking from what appears to be rear main seal. For the sake of my question, let's assume it is (and is not the oil filter to block housing or cooler lines) and assume I take the engine out to fix it. BESIDES the items listed in the transplant guide, are there any "may as well do's" while the engine that has 190Kmiles is out anyway? Compression is 320/320/310/290/300psi COLD and oil pressure at 1.75 bar at 85 degrees C after a hard highway run....is a ring job/crankshaft bearing "cheap rebuild" worth it with those numbers?

Chassis Model Number

W123

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Diesel Engine Specific Aid

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