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7 Series - E23 / E32 (1977 - 1994)

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  #1  
Old 12-12-2011, 01:58 PM
Fernajo Fernajo is offline
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Location: Vermont
 
Join Date: Nov 2011
Posts: 5
Mein Auto: 1991 750iL/1998 740iL
Unhappy 1991 750

Valve lifter(rocker arm) tapping noise from left cylinder bank. What could be the problem? Looking for ideas on what to look for and test I could perform to identify the problem. I'll be removing the valve covers later this week?
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  #2  
Old 12-14-2011, 05:33 PM
TxGr8White TxGr8White is offline
Sick Puppy Motorwerks
Location: Dallas
 
Join Date: Jan 2010
Posts: 132
Mein Auto: BMW 850Ci
remove the valve covers? You do realize that is quite a task. I would try to run "thinner" oil first to see if the noise goes away.
What weight oil are you using now?
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  #3  
Old 08-17-2012, 09:00 PM
Fernajo Fernajo is offline
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Location: Vermont
 
Join Date: Nov 2011
Posts: 5
Mein Auto: 1991 750iL/1998 740iL
sticking valve lifter?

Removed the valve cover and found one oil cowl plugged up. Clean and reinstalled, now when the engine is started all is quiet untill it warms up, then some low level tapping sounds. I wonder if the oil pump pressure is low?
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