E28 Alpina Build - by Pedi

5 minute(s) of a 417 minute read

Friday, and almost weekend. Got a couple of hours untill kids comes home from School and kindergarden, so I wanted to check the oilpan for the very very tiny oil sweat. I could not see the leakage before the fresh oil got a bit more black/dirty.





Not good to see at the pic, but I now have "scratched" into the gap to see it easier.


However, marked up with pen (dotmarks. ..) so I can get it welded.







But first of all, I lift up the engine with such a hoist as I usually use when changing clutch on a FWD car:







But it was such a load on the inner wings of mine, that I instead found the "overhead crane". Can take more weight, and do not charge the chassis either:






Had to drain the oilcollector of mine, so while I waited for it, so I took a picture just as well






Bottom pan went well off, despite destroying the gasket - but Bavaria has more in stock ...







Pump out of the car, ready for dismantling.






Splitted, notice how I take the lock ring off to access the valve:







The parts that are inside the pump:







Note the slot on the piston to the valve







But when I was supposed to measure the wear, I found out that I did not have the specifications of the pump! I was sure I had, but guess not... Anybody have / know-tolerance specs? After what I can remember from faaar back, it is 0.12mm to 0.20mm - but I find no place on the web to verify it.

The first measure I got in was the 0.15mm gauge. 0.20mm was too much, so it would not enter.






Second measure, I got 0.10mm gauge in between, but the 0.15mm was too tight.







So actually I could in a way confirm my memory of tolerance specs 0.12mm to 0.20mm as I have in my head. But please come with suggestions.



So I measured the spring, and got an approximate measurement of 68mm ....







Some parts had to be off. In a way, some good, because then I can spray some color on the alternator as well, to match the rest. LMM and air filter box will also be a bit fresher ..







Took a random main bearing off, and took two pictures. Here is the first instant picture.







Washed off some oil:






I have never taken an inventory check after just a few runs hot, so a little unsure of how much "wear and tear" will occur to the bearings so early. Oil was relatively dirty, so I'm happy to have a start-up oil. Focusing on the next shift will be better.

Hopefully, I will get the oil pan welded tomorrow.

Next issue is to get higher oil pressure. Honestly, I cannot see that the oil pump had so much wear as I had hoped... Do some of you guys have the exact specs/tolerances of the oil pump?