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Location:
Melbourne
Registered:
October 2003
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2tg timinh chain 'jumping' off gears!
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Wed, 04 February 2004 12:47
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hey rebuilding a 2t/3t hybrid, and got a slight problem!
am rotating the engine over with blue tak on the pistons to check for clearance with valves (only one piston installed)
and as i rotate the motor over the cams build up tension in the valve springs, and when the cam reaches past its highest lift point, the spring will force the cam to jump and take up the slack quickly making the timming chain loose it's timing!! hard to explain, but to make what i said a bit clearer, when i rotate the motor over, the timing marks loose a link about once every rotatin.. wirh a sudden 'jump'..
originally i thought i didnt' have all the dampers/guides installed but they are!!? what going on?
The one possible thing i can think of is that the compressiobn from the motor would normally stop it from jumping around like that and throwing the chain out a link??.
Thanks in advance!
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: 2tg timinh chain 'jumping' off gears!
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Wed, 04 February 2004 14:37
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does it have a "hydraulic/oil feed" chain tensioner??
always on the slack side and usually also has a small spring to take out the initial slack.
are you turning it over Backwards???? even then it shouldn't have enough slack for this problem.
i really think you've got a parts mis-match.
its got nothing to do with compression.
i have no experience with this engine.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 2tg timinh chain 'jumping' off gears!
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Wed, 04 February 2004 14:48
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is it jumping a tooth at the top or the bottom sprocket?
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Location:
Melbourne
Registered:
October 2003
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Re: 2tg timinh chain 'jumping' off gears!
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Sat, 07 February 2004 01:13
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id say bottom sprocket.
It's got that big tensioner thats sticks out the side of the head, and its in good.. there is some 'spring' to it too.
wtf is going on?!
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Location:
Canberra
Registered:
May 2002
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Re: 2tg timinh chain 'jumping' off gears!
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Sun, 08 February 2004 07:22
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What you are experiencing here is quite normal! The cams will naturally settle to a point, where there is least pressure being exerted by the valve springs.
IMHO, if the tensioner is in place and in good condition, and primed with oil, I seriously doubt that your chain would jump a tooth on any of the timing gears.
regards Chuck.
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