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Old 08-08-2020, 08:13 AM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
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Quote:
Originally Posted by dahicori View Post
this leak in not that big but still a problem to be solved for sure!!

I'll try to take a clean picture tomorrow or the day after ( I have a foot strain)

He definitly mentionned the front cover gasket. He told me the easiest way to dot it would be to take out the block from the car, but he added that by doing so, I will simply destroy the wiring harness as all the plastics and wires are rotten (car parked in a garage, but still didnt run for 10 years)

I will try to reach mickaelovitch, I know he lives kind of far from my place (France cannot stands comparison with US when it comes to dimensions, but still we can have long trips inside our borders )
I think you will want to check carefully to confirm that is where the leak is. He is right that it is a pretty serious job to repair it, and in some ways, removing the engine might be the easiest way. He is also right that that might do some damage to a fragile old engine wiring harness -- although on these old diesels the wiring is so simple that repairing harness problems is not that big of a deal, especially on a 240 with a non-turbo engine. There are only about 6 wires total in that harness anyway so you could even build a whole new harness from scratch in just a few minutes if you had to.

However, is this a small, slow leak or is it a very large leak where oil is flowing rapidly out when the engine is running? The front cover holds *pressurized* oil inside the engine, not just low-pressure oil, since what we are referring to as the "front cover" is actually the oil pump housing. The only times I have ever seen that oil pump gasket leak, it has been in a way where pressure is escaping and this results in a very fast leak. That was the case, for example, for the one that ngoma and I replaced years ago with the engine still in the car. It had a crack in the gasket on the pressure side, and the leak was so bad that the engine could only be run for a few seconds at a time, or else it would have pumped all the oil out onto the ground!

If what you have is a slow leak, where it's just a little wet, then I still think you might be dealing with a different source that is running down to it. Like the valve cover gasket.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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