bikecarbfred
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| posted on 19/1/19 at 10:50 AM |
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new schrick camshafts making ticking noise? hydraulic lifters 16v
right so i started the rebuild for the first time.
having to contend with all the smoke coming out of the back, fuel ratio not to bad for a first start
got it up to 2000 rpm and kept it there 2 minutes then switched it off as the ticking noise from the cams increases with rpm and somethings not
right.
are new cams supposed to make a noise until they have been run in?
im in the garage to there is echo but still i wanted a super quite drive train.
new valves, guides, cotters, hyrdaulic lifter rockets and cams.
p.s ticking noise is tapping noise.
[Edited on 19/1/19 by bikecarbfred]
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bikecarbfred
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| posted on 19/1/19 at 11:50 AM |
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it's the hydraulic rockers i have. afh engine , im not so good with terminology.
theres the cam, then the hydraulic tappet, 1 inch cylinder shape that sit on valve.
they could be filling up as they are new but i didnt want to take the risk so stopped the engine.
i ran it for 30-40 seconds. at 2000 rpm.
im not sure why there is need for them to fill up. i assumes there's a tiny spring inside of them , that you can't see, that allows some
"give" with the top of the valve stem.
[Edited on 19/1/19 by bikecarbfred]
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Theshed
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| posted on 20/1/19 at 09:48 AM |
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Is it safe to assume:
(1) that you are using a cam designed for the hydraulic lifters (they are very different profiles)
(2) that you used a good quality break in lube for the cam
Is so then it could be just the lifted filling with oil - did you prime the oil pump with assembly live vaseline or some such? Did you look into the
cam cover to see if the top of the engine had lots of oil?
I would take off the cam cover and check for any damaged lobes (it can happen in seconds) and if not spend time checking the oil system.
The lifters are pressurised. when running it is the oil pressure that fills the gap between the valve and cam. It is common to rattle for a few
seconds but they should fill quite quickly if all is correct - most likely culprit is unprimed oil pump
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perksy
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| posted on 20/1/19 at 10:33 AM |
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Are the hydraulic lifters new and did you pre-soak them in new engine oil ?
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bikecarbfred
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| posted on 28/1/19 at 09:39 PM |
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did not pre fill them. a lesson learned for the future.
they noise went away after a few seconds.
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