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Post by minimalal on Apr 25, 2011 20:28:33 GMT
well the 1275's in and..... its not good
ok so we got it idleing ok, sounds fine, then when revved up itll knock from the engine. checked tappets, still the same noise.
we took off the far side/rad side ht lead and the knocking pretty much stopped so think its that cylinder or in that area anyway so if anyone could shed any light or has any ideas, thanks
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Post by Stephen on Apr 25, 2011 20:58:18 GMT
Timing chain?
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Post by 1275elliot on Apr 25, 2011 21:09:02 GMT
we had a look/listen to it didnt seem to be coming from there.
like alex said we took number 1 ht lead of the noise became alot quieter. all the others didnt affect the knocking sound. the noise isnt there at idle only when its revved up and on over run.
we looked at the valve clearances they were all ok.
tried different ht leads
checked for any loose bolts and the fan catching on something but no sign of any problems
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Post by delly on Apr 25, 2011 21:59:00 GMT
did you put new cam follower,s in like i said mate
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Post by AntMan on Apr 25, 2011 22:48:14 GMT
Big end bearings, main bearing...!?! Get a long driver and try and track the noise, screwdriver end on the engine and handle part to your ear. Do this across the whole engine to try find the noise. Might look abit stupid but good way of finding area making noise. Ant  |
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Post by minimalal on Apr 26, 2011 1:26:25 GMT
did you put new cam follower,s in like i said mate yup the new followers are in matt thought it could be bearings Ant, will try finding the area making noise, think itll just be a matter of experimenting. cheers for input guys |
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Post by katentel on Apr 26, 2011 6:49:51 GMT
maybe nothing but the engine i put in victor made knocking like noise removed hts and sure enough noise stopped on one cylinder, engine still ran the same, turns out to be a faulty spark plug whick was new, just dont overlook obvious things just because they may be new, have you done a compression test, if so what were your readings, i believe they should all be around 160-170 also do you have oil pressure
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Post by coleman262 on Apr 26, 2011 17:04:47 GMT
that sounds exactly like what we are experiencing there, as soon as you remove the ht lead its perfect
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Post by 1275elliot on Apr 26, 2011 17:18:31 GMT
im going to do a compression test on it tonight and try some different plugs and dizzy. fingers crossed |
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Post by minimalal on Apr 26, 2011 20:48:01 GMT
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Post by 1275elliot on Apr 26, 2011 21:38:10 GMT
all very strange.my dad suggested maybe something could have fallen in the cylinder and is rattling around but would of thought it would have gone bang by now apart from that really struggling. could just be a knackered engine. another vid of it www.youtube.com/watch?v=rpJJZzlmgfk |
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Post by delly on Apr 26, 2011 21:39:16 GMT
that sounds like the top end not bottom end to me
timing chain cover?
tappets touching rocker cover?
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Post by Miniböttcher on Apr 26, 2011 22:31:43 GMT
when matt had it running it was doing the same thing, but not as loud,( unless its just the speakers on my laptop) but he did say it had a knocking noise when he sold it we did try everything, and put it down to a cam followers as it seemed to be at the rad end behind no 1 cylinder, which is were the followers are we removed the water pump, alternator, fuel pump, everything that runs from the rotation of the engine and it still made that noise,matt also changed the rockers. and run it with no rocker cover but at idle it was quite it was only when the revs were lifted that it start to make a noise, and being that it was only at 1 end, and seem to be at the BACK of no1 cylinder( rad end), we though it should be the followers, but they are now new??? few things, 1. how well did the camshaft fit, was there any sideways movement when fitted, 2, did you put a duplex (twin chain) timing gear on, if so did you remove the tabs from the inside of the timing chain cover 3 how well did the followers fit, did you test each one and check how well they fitted. 4,what was the trush washer at the end of the camshaft like, (the triangle thing with 3 bolts) was it badly worn, was it replaced 5, are the push rods hitting the side of the holes they go through in the head and block 6, was there any bad wear marks or scores in the piston bores 7, is it the same head that came with the engine or a different one, may be worth trying a new head, but thats a long shot,as it seems to be more on the block that the head but worth a try if you have covered all them the only other thing i can think is that it could be mains and big ends,or may be cam bearings, but only at the first stages of going, because if they have gone it would do it at idle as well as when the revs are lifted, but this seems to be only doing it when the reves are lifted,idle is quite, plus only at 1 end?  ? sound bad but its quite simple to do, but does mean it has to come out and split apart again. if it does come to this i dont mind giving you a hand and showing you how to measure and check everything, i have built a few engines and i know the tolances it should have, and what you need to do, fingers crossed it does not come to this and its something simple. |
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Post by AntMan on Apr 27, 2011 15:26:22 GMT
That does sound loud, not just your speakers Dean! I still think big end gone, defiantly needs to come out again for inspection - if it is big end hopefully hasn't damaged the crank. Keep us updated..... Ant |
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Post by delly on Apr 27, 2011 21:28:06 GMT
hope it is some thing simple
if not
like dean has said i,d be more then happy to come over to help aswell
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