timing issues head/jumped timing help
04-06-2009, 11:45 AM
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timing issues head/jumped timing help
hey guys.. im looking for a how to on putting a b18c1 head back in time... my friends head jumped time..hopefully no bent valves... just wondering what i need to look up to get this fixed for him... cause he's broke as hell
04-06-2009, 06:39 PM
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Best way; pull the valve and timing covers, crank pully, the belt, line up all the markson the camgears(arrow/"up" pointing up) and the crank gear with the mark on the oil pump and reinstall the belt. Be sure to retorque the crank pulley bolt.
04-08-2009, 10:42 AM
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My exhaust cam jumped a tooth ahead and I was beating the crap out of the car because I didn't know it jumped timing. We did a leak down and no bent valves. 220 across the board.
04-08-2009, 03:59 PM
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leak down is not really reliable specially if your timing is off.
there should be some leakage there since, well, timing is off and you do a leakdown at tdc with the intake and exhaust valves closed right? my recommendation to you, put no1 at tdc, put the pin punches on the camshaft holes, carefully slide out the timing belt off the cam sprockets, move the sprocket a bit (the one thats out) and put the timing belt back on and reccheck your timing. If the belt is loose, just loosen the tensioner bolt, adjust the tension and retighten the tensioner bolt again.
once done, do a compression test and that should determine if your valves in a certain cylinder is not sealing/bent.
if a cylinder has low compression, and you want to pinpoint what is bent, then you do the cylinder leakage test.
there should be some leakage there since, well, timing is off and you do a leakdown at tdc with the intake and exhaust valves closed right? my recommendation to you, put no1 at tdc, put the pin punches on the camshaft holes, carefully slide out the timing belt off the cam sprockets, move the sprocket a bit (the one thats out) and put the timing belt back on and reccheck your timing. If the belt is loose, just loosen the tensioner bolt, adjust the tension and retighten the tensioner bolt again.
once done, do a compression test and that should determine if your valves in a certain cylinder is not sealing/bent.
if a cylinder has low compression, and you want to pinpoint what is bent, then you do the cylinder leakage test.
Last edited by cruzalekz; 04-08-2009 at 04:01 PM.
04-08-2009, 09:21 PM
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leak down is not really reliable specially if your timing is off.
there should be some leakage there since, well, timing is off and you do a leakdown at tdc with the intake and exhaust valves closed right? my recommendation to you, put no1 at tdc, put the pin punches on the camshaft holes, carefully slide out the timing belt off the cam sprockets, move the sprocket a bit (the one thats out) and put the timing belt back on and reccheck your timing. If the belt is loose, just loosen the tensioner bolt, adjust the tension and retighten the tensioner bolt again.
once done, do a compression test and that should determine if your valves in a certain cylinder is not sealing/bent.
if a cylinder has low compression, and you want to pinpoint what is bent, then you do the cylinder leakage test.
there should be some leakage there since, well, timing is off and you do a leakdown at tdc with the intake and exhaust valves closed right? my recommendation to you, put no1 at tdc, put the pin punches on the camshaft holes, carefully slide out the timing belt off the cam sprockets, move the sprocket a bit (the one thats out) and put the timing belt back on and reccheck your timing. If the belt is loose, just loosen the tensioner bolt, adjust the tension and retighten the tensioner bolt again.
once done, do a compression test and that should determine if your valves in a certain cylinder is not sealing/bent.
if a cylinder has low compression, and you want to pinpoint what is bent, then you do the cylinder leakage test.
Ummm... I didn't recommend a leak down test for timing, I meant that to make sure no valves were bent. Bring the cams and crank to TDC one at a time and test each cylinder. There's no point in lining every thing up, getting the belt on and tensioned, then do a leak down and find that there's a belt valve(s).