majortom4 Posted May 22, 2016 Posted May 22, 2016 Ok so I have just built up my 1216 engine. With some faffing with the timing...... now I have it running and its long smoothly with everything correctly done according to mr HAYNES. now when I Rev it, there is a rattle coming from the cam cover. Is this the cam chain?? I have done the auto chain tensioner how it should be. i read on the internet that these things sometimes stick, it ratcheted out when I turned the engine over by a 19mm spanner. is it correct in thinking it could be stuck between teeth and I should back the bolts out either side of the tensioner until it clicks, then tighten again?? Or am I thinking it is something completely different from the actual problem?? Thanks guys!! Quote
Duckndive Posted May 22, 2016 Posted May 22, 2016 I would take the cam cover off and have a look at tappet clearance 1st then whip the tensioner off 2nd Quote
majortom4 Posted May 22, 2016 Author Posted May 22, 2016 It didn't make the noise when it was standard pistons in so the clearances shouldn't have changed correct?? Or could they?? Quote
Duckndive Posted May 22, 2016 Posted May 22, 2016 If I had took a motor that made no noises apart ...rebuilt it and now it rattles .... Then I would check the obvious 1st ................. What does mr HAYNES say Quote
majortom4 Posted May 22, 2016 Author Posted May 22, 2016 Now you have confused me. whats the obvious?? (first time taking apart a 4 cylinder so not as expert as you) Quote
majortom4 Posted May 22, 2016 Author Posted May 22, 2016 The rocker arms shouldn't be able to move up and down a little when not engaged right?? Quote
Gixer1460 Posted May 22, 2016 Posted May 22, 2016 49 minutes ago, majortom4 said: It didn't make the noise when it was standard pistons in so the clearances shouldn't have changed correct?? Or could they?? No noise when standard but noise now with taller? pistons, closer valve - piston clearances? and possibly incorrect cam timing? and there's lots of reasons for noises! What engine is it, would be a start for diagnosis? Quote
majortom4 Posted May 22, 2016 Author Posted May 22, 2016 Bandit 1200 (now 1216) turbo. 1998. had engine out, re bored and built back up. Starts and runs nicely but has the rattling noise. Checked can chain and seems taught, checked timing 1000000 times and is spot on. just been moving the rocker arms and they have slight up and down movement (maybe 1mm) on all but 1. could this be coursing the noise? I haven't touched them tho just cams off and back in again so don't know how they could have moved..... Quote
Duckndive Posted May 22, 2016 Posted May 22, 2016 1 hour ago, majortom4 said: Bandit 1200 (now 1216) turbo. 1998. had engine out, re bored and built back up. Starts and runs nicely but has the rattling noise. Checked can chain and seems taught, checked timing 1000000 times and is spot on. just been moving the rocker arms and they have slight up and down movement (maybe 1mm) on all but 1. could this be coursing the noise? I haven't touched them tho just cams off and back in again so don't know how they could have moved..... Valve clearance should be ...0.08 -0.13mm with engine cold..... If you have a Haynes then the method is in there ............. Quote
Gixer1460 Posted May 22, 2016 Posted May 22, 2016 (edited) 1mm will deffo sound tappetty ........says the man who did the clearances on both cylinders of a Vee engine WITHOUT turning it 360 degrees! DOH ! ! ! BTW it sounded shocking! Edited May 22, 2016 by Gixer1460 Quote
majortom4 Posted May 22, 2016 Author Posted May 22, 2016 Update!!! Took it all off!!! Threw a paddy and started again. Chain guide out, cans off, tensioner off, the lot. kinda did valve clearances to the best I can without the proper tools. Re did it all and it's fixed!! not got a clue what it was!!!! Quote
majortom4 Posted May 22, 2016 Author Posted May 22, 2016 Only took 3 days of fucking around to sort it...... 1 Quote
Reinhoud Posted May 28, 2016 Posted May 28, 2016 (edited) . Edited May 28, 2016 by Reinhoud wrong info Quote
majortom4 Posted May 28, 2016 Author Posted May 28, 2016 2 minutes ago, Reinhoud said: I didn't read everything; Make sure your engine won't fire up, let the engine turn over, untighten the screw so the automatic tensioner will tighten your can chain tensioner. Then let the screw go/loose. Tensioner should be set right. If it still rattles, tensioner is f@cked, or you need te replace cam chain. A manual cam chain tensioner is not a bad idea. Fixed it buddy :-) dont know what was wrong in the end haha took off and put back all cams etc and it stopped rattling Quote
Reinhoud Posted May 28, 2016 Posted May 28, 2016 The info I gave wasn't right. An automatic tensioner should go tighter when there is a loose part in the cam chain. When you you loosen the screw of the tensioner, the tensioner should be able to go less tight.. Good you fixed it Quote
Gixer1460 Posted May 28, 2016 Posted May 28, 2016 31 minutes ago, Reinhoud said: The info I gave wasn't right. An automatic tensioner should go tighter when there is a loose part in the cam chain. When you you loosen the screw of the tensioner, the tensioner should be able to go less tight.. It won't go 'less tight' as the ratchet will hold it static but you will lose spring tension against the plunger. If its just one click you want then loosen the two mounting screws so whole tensioner backs off by a mm which is about one click on the ratchet - you could bollux the gasket if its never been removed since being built! Quote
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