Hi Guys,
As some of you know,my healey is a 65 HBJ8.My question is this.Can anyone give the exact location of the relief valve on a 2912cc engine?As always,your help is appreciated
Bobby R

It's down by the Oil filter. Should be about a 1 inch plug or bolt.You are getting a early start to the day.

Mark

As seen bottom/center, below my home-made oil cooler adapter.

Hi Guys,
Thanks for the quick response. Last night I pulled the starter out to clean up the drive and when removing the oil filter,I thought that cap was the valve.I'm going to shim the spring and see if I can't get about 10 lbs more of oil pressure.Again,thanks for yor help.
Bobby R

Bobby

Are you having problems with your oil pressure then ? i can only get about 20psi on engine turnover and have yet not found the reason why, although Dave Russell suggested it could be the pressure relief valve not seating properly, any ideas.

Rob

For whatever it's worth:
When I first got my BN2 with around 85,000 miles on the lower end, the oil pressure ran around 55 psi cold, 25 hot idle, & 45 hot run at 3,000 rpm.

I experimented with shimming the presure relief plunger spring .160". The pressures were the same, no change. Next I
added a .360" long spacer in place of the .160" spacer. The hot oil pressures went up to 40 at idle & 60 hot run at 3,000. I expected the hot run pressure to go up because of the additional spring pressure raising the pressure relief setting. What I didn't expect was the increase in idle pressure since 40 is well below the relief blow off setting of 60. Pressure now never goes below 40 at idle, or above 60
running. Of course idle pressure drops from 60 to 40 as the oil gets hot but It used to drop to 25.

I came to the conclusion that the regulator valve was leaking (bypassing) all of the time (not fully seating) & causing the low idle pressure. The additional spring pressure caused the regulator valve to fully seat & raised the idle pressure which was previously leaking through the non seating valve. The first try shim of .160" apparently
was not enough additional spring pressure to fully seat the valve.

It is possible that by checking for full valve seating & lapping the valve to it's seat that the low idle pressure would have been considerably higher without the spring change.

On my particular engine, a spring shim of more that .360" would result in the relief valve not uncovering the bypass port due to spring coil bind & complete blocking of the regulator, so .360" was the limit, but fortunately just the right amount.

It might be useful for you to experiment with the regulator valve seating & spring pressure.

Regards,
Dave

Dave

I will try a .360" shim (what is that in mm ?)

Rob

9.144mm

Thanks Greg, never was very good at inches, too young i suppose.

Rob

And I'm too old for metric

I'm just glad there are only two major choices.
D

Too old to Rock and Roll, Too young to die!

Dave

On speaking with my local engineer he suggested that the end of the pressure relief valve should be rounded and not like the one i have which is tapered, i know where this relief valve came from (a company known to me for getting things wrong) so i am now suspecting that i have the wrong valve.
I have tried to attach a picture of my one to let you have a look (although this is my first attempt at pictures so it may well not appear !) if not do you have a picture of a correct one.

Rob

Rob,
See the attached pic. I can't tell for sure from your pic but you appear to have a six cylinder valve which is stepped, as you can see. If we indeed are discussing the BJ7, this would be the correct valve.

We are still not sure that this valve is completely seating. To check, coat the valve and the seat with layout dye, rotate the valve against the seat & examine both for a full circle marking that shows a complete seat all around.

Not easy to do this in that small hole but with good lighting & the valve on the end of a tightly fitting stick the valve can be rotated against it's seat.
Best,
D

OK, I give up ... where did y'all find a 0.360" (or, for that matter, a 9.144mm) shim suitable for use behind the oil relief valve spring?