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Old 11-11-2011, 02:38 PM   #1 (permalink)
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Angry 95 530i 3.0 lost compression HELP!!

I will try to make this short. I replaced my power steering hoses and motor mounts on a 95 530i 3.0. I followed all the safety stuff, like disconnect the battery and such. Everything went just fine. All back together and started the engine and it ran for about 30 seconds and then died. I tried to start it again and it sounds like there is no compression. I checked for fuel and spark and everything is there and working. I checked under the oil fill and the chain is turning. I then did a compression check on one cylinder and it only has 75 pounds. Does anyone have any idea what could cause this? Does anyone have a breakdown of the timing components on the 3.0 engine? Any Help would be greatly appriciated. Thank You in advance.
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Old 11-12-2011, 04:58 AM   #2 (permalink)
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Have a look at RealOEM.com Diagram Selection, that gives you a few diagrams to look at.
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Old 11-12-2011, 07:45 AM   #3 (permalink)
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thank you so much. I guess I am not as good with a puter as I thought. I spent at least 8 hours yesterday trying to find just what you sent me. Thank you again.
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Old 11-12-2011, 04:02 PM   #4 (permalink)
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Feel free to bookmark that site. Its a useful resource, especially when you are trying to sort out part numbers etc.
Good luck with your engine problems, let us know what youend up doing to resolve the issues.
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Old 11-12-2011, 08:12 PM   #5 (permalink)
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Thank you. I already did that. It looked to me like someone had been in there before working on either the Alternator or power steering hoses. It looks like they may have used heat of some kind in the area because it is charred in the general vicinity. Also the wires to the Alternator were bare in a couple of spots and the small wire was spliced. There was also a heat shield that wasn't there. I use heat shrink and soldered it back to original and found a shield in the wrecking yard. It does seem to turn a little slow. The battery seems to be a little low. I think I am going to check all the connections and grounds to see if it is just turning too slow to build the compression needed. If anyone has anymore ideas, please feel free to chime in here. I have been turning wrenches for over 40 years now, but as any good tech knows, there is always more to learn. I am by no means up on BMW's. I have done a lot of work on them, but have never gotten into a compression issue or electrical issue on one. I guess I will learn though. I really don't have a choice. Thanks again for any help. I will be posting what I do find all the way through this. Knowledge is a good thing, especially from experience.
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Old 11-12-2011, 10:07 PM   #6 (permalink)
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did you do a compresion check on all the cylinders or just on the one?
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Old 11-13-2011, 01:47 AM   #7 (permalink)
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Make sure that the engine block has a good earth connection.
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Old 11-13-2011, 07:12 AM   #8 (permalink)
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did you do a compresion check on all the cylinders or just on the one?
I just checked the one so far. I am going to check them all after I check all the connections and the grounds. Any idea where the ground wire attatches to the engine? thank You.
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