Oil Pump Bolt Part Number Question

NMEXPAT

Well-known member
I realize this might be a long shot.

I've rebuilt my oil pump on my 3.5L V8 defender. I was having very low oil pressure problems. I bought the booster plate and adjustable pressure kit from TA performance. My low oil pressure problems appears to be solved.

However, I have a serious oil leak on the bottom of my oil pump, coming from the ottom bolt. The brass one in the center of the photo, with the oil drop forming. Currently there is a brass bolt installed, but it was very loose. I don't think it is the correct one. When I removed it, it had a serious amount of teflon tape. When I reinstalled it, I put a normal amount of teflon tape on it, but it is still leaking. There's no point in measuring the thread pitch of the brass, because it is not quite right.

I've looked at multiple parts diagrams, and can't find a clear part number for the bolt and the sealing washer.

Does anyone know the part number? I think it is part number 273166.

Does anyone know the diameter and thread pitch? All I can find online is for diesel engine variants. It might be 1/2" 20 UNF?
PXL_20211222_211658520.jpg
 

NMEXPAT

Well-known member

#7 & #8

That's the plug that holds the oil pressure spring in place. If a new plug doesn't do it the pump body is stripped. It shouldn't have Teflon on it . Dangerous.
I'm sorry for the confusion.

I'm looking for a bolt where 13, 14 and 15 go. This is directly on the bottom of the pump.

I just installed the TA performance adjustable spring, when rebuilding, where #7 and #8 go, which are on the side. Definitely not the same diameter or thread pitch.
 

NMEXPAT

Well-known member
Bolt and washer #9 and #10 in this diagram.

Some places only say it's part of a larger kit or don't really show it, except that one part number
Screenshot_20211224-145807.png
 

NMEXPAT

Well-known member
A final follow up to this thread.

Bolt with a part number 273166 does indeed fit there.

The following might seem trivial or minor to those with more practical mechanics knowledge than me, but I'm posting this to help a future unknown newb.

There are two additional ports on the oil pump. One is where the oil pressure switch is located.

I'm using the other for a vdo pressure sender.

The diameter of that port is 1/2 inch with a 20 thread pitch.

The vdo sender I have has 1/8 27 npt. I was unable to find an adapter that had 1/2 20 as the larger size. I had to make a custom fitting. I bought a 3/4 long 1/2 inch by 20 bolt and drilled it out and tapped the head.

The original custom fitting was poorly made and decided to seriously leak. The 3 photos show the following, new fitting vs old, new fitting with send, and finally oil pump all assembled and leak free.
 

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