 How can valve clearances get TIGHTER since rebuild??? |
 Mar 18, 2014 - 9:12 AM
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Enthusiast Joined Dec 31, '13 From Yorkshire England Currently Offline Reputation: 0 (0%)  |
Hey all, just wondered please if someone could help me get my head round this...
After rebuilding my st205 head and working to Toyota spec (0.15mm - 0.25mm inlet / 0.25mm - 0.35mm) all of a sudden the head developed a loud knocking and a leak at the crank seal... After checking all of clearances (forged rebuilds now done 2000 miles) no1 cylinder exhaust valve nearest the cam pulley has shrunk to 0.20mm!!!. After turning the crank by hand it gets harder to turn as this valves opening... I rebuilt the head with JUN valves and springs and HKS 256 cams. All was in spec after the rebuild. Thought clearances opened up as the engine broke in not got tighter! The engine was stone cold (left overnight) when I checked. The head was also proffionally rebuilt... Could this be a worn valve seat possibly? Any thoughts/advice or previous experances pike this would be really appreciated. Thanks Chris : ) |
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Mar 18, 2014 - 8:18 PM
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Enthusiast  Joined Mar 11, '06 From Way South Chicago Currently Offline Reputation: 0 (0%) |
Better pull the head to make sure you didn't get a mushroomed valve face.
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Posts in this topic
Dudleydaftdog How can valve clearances get TIGHTER since rebuild??? Mar 18, 2014 - 9:12 AM
Special_Edy The cam lobes and lifter shims are subject to slig... Mar 18, 2014 - 3:01 PM Smaay QUOTE (Special_Edy @ Mar 18, 2014 - 1... Mar 18, 2014 - 11:54 PM
Dudleydaftdog Thanks so much for all your help all. Have skimmed... Mar 19, 2014 - 9:40 AM |
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