Found another leaky bit on my GD300 1986.
A small amount of engine oil is leaking between the diesel injection pump and where it's mounted on the engine.
Looked it up in the maintenance book, but not understanding german perfectly. I'm a bit misty as to where the seal is actually located.
So if any of you guys have allready had the diesel injection pump off the engine. A little shunt in the wright direction would be a great help.
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Chris
Toy HDJ 80 1994
Merc GD300 1986
Hi Chris, There is a gasket between the injection pump and the engine block mounting surface.
Before you go through replacing this gasket check to see if the three nuts that hold the pump to the block are tight enough.
If that doesn't stop the leak then you have a job you might want to leave to a professional who knows how to time the pump because to replace the gasket means removing the pump. The hard lines need to be disconnected and the feed for fuel and return as well as the throttle linkage etc.. The motor needs to be set at exactly Top Dead Center and not disturbed. The pump can be removed and the gasket replaced. Then the pump TDC spline orientation needs to be exactly set and reinstalled. The problem is the orientation of the pump to the block sets exacly the fuel delivery timing, so the "begin fuel delivery" moment needs to be reset. It might be possible to carefully mark the injecton pump's orientation in a couple of spots where the pump currently mates with the block, but most likely the pump timing will have to be reset. This requires a couple of special tools and attention to detail following a factory manual. It can be done, I did it with a manual in hand when I rebuilt one of these diesels.
My question would be "how bad is the leak?" after you tighten the mounting bolts. The correct fix is pretty involved, I hope you can stop it the easy way. Best of luck,
I thought as much.
Talked to the local Benz dealers and these guys resorted to scratching the itchy brain and weird mimicary on the facial expression.
That's G's for you.
Anyway, the bolts are nice and thight and the leak I'm talking of is a daily teardrop of oil.
I'm giving it a longshot without taking off the pump. Because incorrect timing is the last direction I'm willing to take. Could be a "loving kiss of death" on the engine with about 450.000 kms on it.
I'm going the clean off all the oil residue with some degreaser, give it an acetone treatment and then the longshot.
Dripping loctite onto the gasket seal, I'm hoping it will run around the seal and fill in the tear in the gasket. Loctite superglue has a tendency to get into the cracks of gaskets.
It's a repair I make on engine crankshaft casings pulling in "bad air" on STIHL chainsaws and motor equipment.
I'll keep you posted.
By the way, I got a new truck when I replaced the motor and tranny mounts. A really satisfying repair.
Sounds like a good idea. The oil is not under pressure there. Permatex makes some sealant gasket maker that is wicking that might do the job. A bead around the outside should work I'll bet. Good luck.
I bled some superglue around the flange. Gave it an infra-red treatment.
Then mixed up a 2 component epoxy resin glosscoat which binds to both metal and "plastics".
It's the same thing used for fishing rods and surf-boards so it has some flex when hard.
Also gave the gasket area a nice smear all around.
And the infra-red treatment.
Today the G ran a 50 km round trip in town and the gasket remains nice and dry.
So I'm hopefull for a decent "cheap and cheerfull" repair.
Allthough I'd rather have put a new gasket in there anyway!
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