[Fot] Fw: Help with Oil Pressure Problem

[John Wagner]

make sure the plugs on the ends of the rocker shaft are tight or have popped
out.  As Tony would  say Don't ask me why I know that.



On Saturday, March
8, 2014 11:20 AM, Larry Young <cartravel at pobox.com> wrote:
 
I agree it would
probably not be excessive rocker clearance as Greg 
explained.  However, no
one has mentioned excessive cam bearing 
clearance. Not long ago we discussed
this same problem with 6 cylinder 
motors. My TR250 has the same symptoms and
I have wondered if cam 
bearings would solve the problem.


On 3/6/2014 8:32
PM, Greg Solow wrote:
> I do not believe that the rocker assembly could cause
this.  The 
> standard oil feed is though a restricted hole from the rear main
> bearing to the rear cam bearing, then the feed is intermitently pulsed 
> by
the rotation of the camshaft lining up a spiral groove in the rear 
> cam
journal and some flats machined into the journal. I have by passed 
> this
system and fed oil directly from the restricted drilling from the 
> rear
main, to the drilling that goes up to the head. Doing this feed a 
> lot more
oil the the rocker gear, but did not affect oil pressure at all.
>   
Excessive clearance in the oil pump, either excessive end float on 
> the
gears or excessive tip clearance between the rotors will give low 
> oil
pressure at idle, The oil leaks back withing the pump at it 
> rotates slowly,
but at the reves come up and the pump turns faster, I 
> think it can overcome
this internal leakage and the pressure in the 
> engine will come up.
>       
                Greg Solow
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