Posted by Dick New York on March 17, 2013 at 20:23:32 from (67.255.63.34):
In Reply to: Main bearings? posted by aarolar on March 17, 2013 at 11:11:22:
First , check the guage , or replace it with a new one . Being that the pressure drops when hot , it is probably not the guage , but that is a good place to start . Second , pull the base , and check the pump . Sounds like they are a weak point . Third , plastiguage the mains that you can access , and the rod bearings . ?? Do you hear any knocks when it is hot . Have someone explain to you the different conditions , and sounds of rod , and main bearing knocks . They sound different , and happen under different operating conditions . A bad main bearing can be annoying for a long time , but running with a bad main can cause damage over a period of time . A rod bearing is more serious . It will only knock for a short time . The bearing will eventually spin , and sieze on the crank , and when it goes , it is a disaster . Chances are good that if a rod goes , it will ventilate the side of the block because it will break the rod when the bearing siezes . Good luck
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