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2.5 broker valve rockers


 
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shogun3.2did
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Age: 35
Zodiac: Virgo
Joined: 30 Jan 2014
Posts: 44
Location: ireland

PostPosted: Mon May 02, 2016 2:23    Post subject: 2.5 broker valve rockers Reply with quote

Hi I got a shogun sport the other day cheap as the engine went.  Now I don't know much about engines but I decided to investigate the cause.   I want to put the 4x4 on the road again but I'd rather fix the engine I have rather than replace it so here it goes.  

I took the rocker cover off and there were 3 rockers broken and and the engine cam caps all 5 were broken.  So I then checked the timing.  The timing on both belts and the timimg was perfect.  So I am left stumped at what could have caused this.  However the rockers than remained were rather loose as in a 5 mm gap between the tapir and the valve.  What could have caused this and what is the best solution to fix this the timing belts wer done at 115000 and there is 127000 on it now.  

Any help advice or I put would be great as I want to keep this engine in as I know it from new and was never abuse owned and driven by an elderly couple.
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PostPosted: Mon May 02, 2016 2:23    Post subject: Google Ads keep the POCUK free to join!


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Sparksie
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Age: 57
Zodiac: Virgo
Joined: 09 Sep 2018
Posts: 24
Location: Ireland

PostPosted: Tue Sep 11, 2018 4:07    Post subject: Reply with quote

Hi
I suspect the belts were done last time, following a break, or more likely a slip.
This is supposed to break the rockers, to protect the cam, valves and pistons, but it's not always obvious, especially to a novice, when the rockers are cracked but haven't actually disintegrated.
Upon reassembly, any cracked rockers will have enlarged clearances, but possibly not too much to be adjusted, so the novice does that and the engine runs, for a while.
Sooner or later, of course, the damaged rocker(s) will fail and the affected cylinders will stop firing.
Then a mechanic who doesn't know the history faces the conundrum you currently have... a perfectly timed engine, with a lunched top-end!
I'd advise getting a full set of rockers and caps and check the rocker shafts carefully for any scoring that may have been caused by running with damaged rockers. Replace them if anything you can feel with a fingernail is found
Good luck with it

Sparksie
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