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Camshaft Help Every lobe worn down Except #1 Cylinder
Posted: Fri Jun 12, 2009 8:45 pm
by camaro1974
I have a 350 Small Block it has been rebuilt about 7 years ago.I
just put a new crane cam it ,I took it to a mechanic to set the valve lash
and he told me #1 cylender rocker arms dont seem to be opening te same distance as the other rocker arms. any suggestions
Re: Camshaft Help Every lobe worn down Except #1 Cylinder
Posted: Fri Jun 12, 2009 9:16 pm
by 99R/T
camaro1974 wrote:I have a 350 Small Block it has been rebuilt about 7 years ago.I
just put a new crane cam it ,I took it to a mechanic to set the valve lash
and he told me #1 cylender rocker arms dont seem to be opening te same distance as the other rocker arms. any suggestions
A little more info would help greatly.
What are the cam specs supposed to be? Who installed it? Roller, Flat, Hydraulic, or Solid? New lifters or old? How was it broken in? How much run time is on it? What springs are you running? Why did you switch cams?
Posted: Sat Jun 13, 2009 12:59 am
by Engguy
Mad Crane employee last day before they shutdown.
Empty hydraulic tappets for that cylinder, and mechanical on the others?
Push rods colapsing.
Studs pulling.
Some ideas here.
Re: Camshaft Help Every lobe worn down Except #1 Cylinder
Posted: Sat Jun 13, 2009 6:48 am
by cjperformance
camaro1974 wrote:I have a 350 Small Block it has been rebuilt about 7 years ago.I
just put a new crane cam it ,I took it to a mechanic to set the valve lash
and he told me #1 cylender rocker arms dont seem to be opening te same distance as the other rocker arms. any suggestions
?? Dont 'seem' to be opening as much. Has an actual measurement been taken?
No matter what cam/lifter type it is it needs accurate measurements, that need to be compared to the cam's spec's.
First up take a lift fig for each lobe (not valve), compare these to see if there is a prob, then go from there. Bear in mind that intake and exhaust may or may not be the same for it may have a dual pattern cam but all intakes should be the same and then all exhausts should be the same.
Cheers,
Re: Camshaft Help Every lobe worn down Except #1 Cylinder
Posted: Mon Oct 12, 2020 11:59 pm
by MadBill
If you ran it at all before taking it in for adjustment, most likely it has wiped out the #1 lobe. If there's no huge lash when the valve is closed and it opens visibly less than the others, unfortunately there's really no other logical explanation.
Re: Camshaft Help Every lobe worn down Except #1 Cylinder
Posted: Tue Oct 13, 2020 12:41 am
by dannobee
How did you break in the cam? Did you use the assembly lube recommended by Crane? Did it idle at all in the first half hour of run time?
Re: Camshaft Help Every lobe worn down Except #1 Cylinder
Posted: Tue Oct 13, 2020 3:35 am
by Geoff2
11 year old thread....
Re: Camshaft Help Every lobe worn down Except #1 Cylinder
Posted: Tue Oct 13, 2020 9:37 am
by MadBill
Geoff2 wrote: ↑Tue Oct 13, 2020 3:35 am
11 year old thread....
