SuperV8 wrote: ↑Tue Jul 13, 2021 9:56 am
rich112 wrote: ↑Mon Jul 12, 2021 7:25 pm
Been looking again at the oil pump relief valve.
Looking at it in close up, there is scoring and pitting in the bore.
The piston doesn't want to drop back in there either.
WIN_20210712_19_14_46_Pro.jpgWIN_20210712_19_14_23_Pro.jpg
If I set my bore gauge at the bottom of the bore, it goes tight where the pressure relief port is, right where the scoring and pitting is.
I think I am going to clean the bore up so the piston slides in there nice and then put it back on and see if I get any pressure with a drill down the dizzy hole.
Then I'll try turning over the motor with the plugs out on the starter and see if there's any pressure.
What about the surface of the inside of the pump? -
The pump will need a nice surface finish with minimal clearance from case to tip in order to pump effectively.
It may result in low oil pressure? These pumps where never 'high' pressure even when working well. Might be able to band aid it with some thick oil?
Also as you have the sump of I think I would have a look at some of the main bearing shells to see what they look like?
Yes the inside of the pump surface is rough as fruck...
I can tidy it up a little but if the clearance is over 6 thou (0.15mm) then the timing cover is toast I guess.
I might check the big ends and caps. I really want to free up the relief valve and see if I get any pressure with a drill on the pump though... TBH getting the sump off is easy on this car. There's loads of room and clearance.
I am wondering what's first to suffer with low oil pressure though? Camshaft and followers, rockers, conrod bearings or mains?
Whats the best way to take, say one main cap off and more importantly put it back on? This engine has cross bolted mains.
Undo the caps and cross bolts all together, bit at a time?
After inspecting, do the opposite, wind all the bolts back in to the full torqure, bit at a time?