Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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jaygerding
john gerding

(18 posts)

Registered:
06/14/2017 09:33PM

Main British Car:


Still fighting the oil pressure demon.
Posted by: jaygerding
Date: November 16, 2017 06:13PM

Since I last posted about this, I have pulled the engine completely apart (Rover 4.0 with the front cover, etc, from a 3.5), had the crank re-ground and installed new cam shaft bearings.

Now, when I run the oil pump with an electric drill, I get up to 15 lbs. of pressure. BUT, when I install the distributor, I get nothing. I HAVE checked to see if the distributor is, in fact, turning the pump, and it is. In fact, the engine starts and seems to run fine, although a bit noisy, because, no oil pressure (I have a professional oil pressure gauge hooked into the system.).

Understand that this front cover, oil pump and distributor are the SAME ones that worked fine, with plenty of pressure, on my old 3.5. The reason for the upgrade to the 4.0 was a bad block.


donkelly23
Don Kelly
Charleston, SC
(96 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Still fighting the oil pressure demon.
Posted by: donkelly23
Date: November 17, 2017 11:52AM

So you're using the 3.5 cover?


jaygerding
john gerding

(18 posts)

Registered:
06/14/2017 09:33PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: jaygerding
Date: November 17, 2017 01:32PM

Yes, I am using the 3.5 cover, which was functioning perfectly when the 3.5 was in use. I do have the special spacer for the crankshaft.


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Still fighting the oil pressure demon.
Posted by: mgb260
Date: November 17, 2017 01:52PM

John, Is the relief valve stuck? Did you pack the pump with Vaseline?


donkelly23
Don Kelly
Charleston, SC
(96 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Still fighting the oil pressure demon.
Posted by: donkelly23
Date: November 17, 2017 01:55PM

Jim, since I'm nowhere near the expert you are ...
If he can spin the dizzy and get pressure, would he need to pack the pump?

John, how long did you let it run noting no oil pressure and how much time elapsed between the drill and the car running?


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Still fighting the oil pressure demon.
Posted by: mgb260
Date: November 17, 2017 02:08PM

Don, I always pack the Buick/Rover pump with Vaseline. I use the drill too and usually have a lot of resistance and over 30 lbs oil pressure on the gauge. I also watch for oil up at the rockers. Maybe I'm a little paranoid. John are you running the closer bearing clearances the motor requires? .001-.0015 instead of SBC .002. Lots of info here and on V8Buick sight for improved oiling mods.



Edited 1 time(s). Last edit at 11/17/2017 02:12PM by mgb260.


donkelly23
Don Kelly
Charleston, SC
(96 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Still fighting the oil pressure demon.
Posted by: donkelly23
Date: November 17, 2017 02:36PM

He's been posting his problems with the TWOA and really not having any luck.
He did say there that he's finding oil at the rockers with the drill.
I'm think that if he used the drill and got OP and then waited a while before he started it and didn't get any the oil was probably drained from the pump.
Other than that I'm clueless and will await the lots smarter people here



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5354 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Still fighting the oil pressure demon.
Posted by: BlownMGB-V8
Date: November 17, 2017 05:10PM

Check the shear pin in the distributor gear. If that goes there's no oil pump drive.

Jim


jaygerding
john gerding

(18 posts)

Registered:
06/14/2017 09:33PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: jaygerding
Date: November 17, 2017 06:31PM

I had the crank re-ground to the tighter tolerances.

I have switched back and forth between the drill and distributor (I turn it with the starter.) The drill always gives OP, with the distributor, nothing. I KNOW the distributor is turning the OP because I can see the flange in different positions.

I have ordered one of those WiFi endoscopes to stick down through the Dist. hold down clamp hole. I tried renting one from Autozone, but the tip was too big to go down the hole. I think the WiFi tips are smaller, and should fit.

I can detect no slippage in the distributor shaft, but I am going to disassemble it just to check out the pins, etc.

I have posted this problem on other forums, in the hopes that something new will be suggested. I talked to the machinist today who did the bearing work, and he also insists that the problem lies in the dist. shaft.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5354 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Still fighting the oil pressure demon.
Posted by: BlownMGB-V8
Date: November 17, 2017 06:36PM

Might have the drive gear and fuel pump cams switched on the nose of the cam.

Jim


MG four six eight
Bill Jacobson
Wa state
(274 posts)

Registered:
10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: Still fighting the oil pressure demon.
Posted by: MG four six eight
Date: November 17, 2017 10:19PM

I was just thinking the same thing as Jim!


jaygerding
john gerding

(18 posts)

Registered:
06/14/2017 09:33PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: jaygerding
Date: November 17, 2017 10:22PM

Then why would the distributor be turning?


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5354 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Still fighting the oil pressure demon.
Posted by: BlownMGB-V8
Date: November 17, 2017 11:40PM

Then you need to look at the engagement between the end of the oil pump and the drive tang of the distributor.

Jim


had to buy it
Lorne Mitchell
Toronto, Ontario
(16 posts)

Registered:
11/04/2013 06:09PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: had to buy it
Date: November 18, 2017 07:46AM

How fast are you running the drill to get 15 psi? If you need the drill running at full speed to get 15 psi you might have an air leak somewhere.

I had a similar problem using an early front cover on a 3.9. I took the front cover off to make sure the oil pump was engaging properly. Everything looked to be working fine. I used a Buick 215 cover gasket instead of the one that came in the 3.9 gasket set when I put it back together. With the drill turning the pump I got 50 psi and on start up 50 settling down to 30 psi idling at around 1000 rpm.

Unfortunately I ran the engine too long with little to no pressure. When I took the motor apart , all the bearings were scuffed up pretty badly so its rebuild time this winter.


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Still fighting the oil pressure demon.
Posted by: mgb260
Date: November 18, 2017 10:18AM

Lorne, You may be on to something. Could be gasket where pickup bolts to block also. It may be cavitating and not priming. Try packing the pump with Vaseline.



had to buy it
Lorne Mitchell
Toronto, Ontario
(16 posts)

Registered:
11/04/2013 06:09PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: had to buy it
Date: November 18, 2017 02:58PM

To check for air leaks somewhere on the suction side of the oil pump, remove the relief valve piston and put the cap back.
Connect a hose to the output side of the pump that leads to the remote filter.
Run the pump with the drill. If the oil delivered to a container is frothy or intermittent in flow there is a leak on the suction side.

When you run the drill in reverse the oil should pump quickly and without a sucking sound back to the oil pan through the pick up.

After you solve the problem dont't forget to put the OP relief valve back in.


jaygerding
john gerding

(18 posts)

Registered:
06/14/2017 09:33PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: jaygerding
Date: November 18, 2017 04:14PM

Not sure where a remote filter would hook in. This pump includes a mount for the filter.

I am running the drill at 1200 rpm to get 15 psi.

Other than the oil pick up in the pan, where else could their be a problem with suction?


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Still fighting the oil pressure demon.
Posted by: mgb260
Date: November 18, 2017 04:35PM

Like Lorne says, wrong timing cover gasket?


had to buy it
Lorne Mitchell
Toronto, Ontario
(16 posts)

Registered:
11/04/2013 06:09PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: had to buy it
Date: November 18, 2017 05:13PM

Sorry my 3.9 is in an MGB. Couldn't make room for a filter on the front cover so I used a remote.

You may have a leak at the front cover gasket. If the mating surfaces are scored or not flat they will leak either air or coolant or both.
Also check to see that the gasket you use covers any passages on the front cover that doesn't match up to passages on the front of the block.

Have a look at the pics in this link. Hope it works I'm not that good at these things.

[1drv.ms]


jaygerding
john gerding

(18 posts)

Registered:
06/14/2017 09:33PM

Main British Car:


Re: Still fighting the oil pressure demon.
Posted by: jaygerding
Date: November 19, 2017 03:34PM

The gasket is correct, and the pin in the distributor is intact.

At this point I am wondering if I don't have a crack in the front cover. I think I will take it off tomorrow and get it checked out.

I am using up whatever wit's I had on this one. Got two waiting in the driveway to get working on.

Thanks for all of the input!!
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