BBC Oil Pump Recommendations

Tgreen3724 · 07-18-2013, 08:33 AM

Pulled the motor out after noticing drop in oil pressure and the rear main and one of the other mains were ate up. The rear main looks like it was starved of oil was on the verge of failure. We ran our current pump most of last year without issue but this year we only got about 10 - 15 runs on new bearings before I noticed drop in pressure.

Was hoping you guys could provide some opinions;

What pump do you guys like to run in a BBC?

What pressure range do you like to see?

Any help would be greatly appreciated.

Ed Wright · 07-18-2013, 10:14 AM

Lack of oil has always been up front, last bearings to get oil, in my limited experience. I kinda doubt the pump is your problem.

Alan Roehrich · 07-18-2013, 11:23 AM

Wet mag the crank, check it for straightness, size, taper, and roundness.

Then check the main bores for size, roundness, and straightness.

Odds are you'll find something .

Mark Lewis · 07-18-2013, 11:32 AM

What does the flange on the rear main brg look like?

Have you changed trans or converter?

Might have a thrust bearing problem instead of oil pump.

Ed Wright · 07-18-2013, 12:39 PM

^^^^ More likely.

Tgreen3724 · 07-18-2013, 03:21 PM

thrust bearing and rod bearins all look fine. One thing is the front of the main bearing (flange) was rubbed down to the copper, like the crank had pushed back toward the converter. Doesnt make sense because I thought typically the crank would push toward the front of the motor if any as a result of converter ballooning. Does this indicate anything in particular? Having crank magged and block checked for proper line hone.

Tgreen3724 · 07-18-2013, 03:25 PM

also converter and trans are same no change whatsoever.

Larry Hill · 07-18-2013, 10:01 PM

Take it across the "River" and let Jeff Taylor look at it and check it out, you will be head in the long run.

Mike Taylor 3601 · 07-19-2013, 07:58 AM

I'd say good chance your crank is cracked and flexing,you said had about 15 runs on bearings,what was the old bearings like or was it first build?

Your on the right track checking crank and line bore
Mike Taylor 3601

Tgreen3724 · 07-19-2013, 09:18 AM

we took the whole thing apart this past winter and replaced the bearings. The bearings we took out looked flawless.

07-18-2013, 08:33 AM	#1
Tgreen3724 Junior Member Join Date: Oct 2007 Location: Shepherdsville, Ky Posts: 38 Likes: 0 Liked 1 Time in 1 Post	BBC Oil Pump Recommendations Pulled the motor out after noticing drop in oil pressure and the rear main and one of the other mains were ate up. The rear main looks like it was starved of oil was on the verge of failure. We ran our current pump most of last year without issue but this year we only got about 10 - 15 runs on new bearings before I noticed drop in pressure. Was hoping you guys could provide some opinions; What pump do you guys like to run in a BBC? What pressure range do you like to see? Any help would be greatly appreciated.

07-18-2013, 10:14 AM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: BBC Oil Pump Recommendations Lack of oil has always been up front, last bearings to get oil, in my limited experience. I kinda doubt the pump is your problem. __________________ Ed Wright 4156 SS/JA

07-18-2013, 11:23 AM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: BBC Oil Pump Recommendations Wet mag the crank, check it for straightness, size, taper, and roundness. Then check the main bores for size, roundness, and straightness. Odds are you'll find something . __________________ Alan Roehrich 212A G/S

07-18-2013, 11:32 AM	#4
Mark Lewis Member Join Date: Apr 2006 Posts: 344 Likes: 63 Liked 207 Times in 44 Posts	Re: BBC Oil Pump Recommendations What does the flange on the rear main brg look like? Have you changed trans or converter? Might have a thrust bearing problem instead of oil pump.

07-18-2013, 12:39 PM	#5
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: BBC Oil Pump Recommendations ^^^^ More likely. __________________ Ed Wright 4156 SS/JA

07-18-2013, 03:21 PM	#6
Tgreen3724 Junior Member Join Date: Oct 2007 Location: Shepherdsville, Ky Posts: 38 Likes: 0 Liked 1 Time in 1 Post	Re: BBC Oil Pump Recommendations thrust bearing and rod bearins all look fine. One thing is the front of the main bearing (flange) was rubbed down to the copper, like the crank had pushed back toward the converter. Doesnt make sense because I thought typically the crank would push toward the front of the motor if any as a result of converter ballooning. Does this indicate anything in particular? Having crank magged and block checked for proper line hone.

07-18-2013, 03:25 PM	#7
Tgreen3724 Junior Member Join Date: Oct 2007 Location: Shepherdsville, Ky Posts: 38 Likes: 0 Liked 1 Time in 1 Post	Re: BBC Oil Pump Recommendations also converter and trans are same no change whatsoever.

07-18-2013, 10:01 PM	#8
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,613 Likes: 1,896 Liked 10,651 Times in 2,210 Posts	Re: BBC Oil Pump Recommendations Take it across the "River" and let Jeff Taylor look at it and check it out, you will be head in the long run. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

07-19-2013, 07:58 AM	#9
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,361 Likes: 333 Liked 279 Times in 96 Posts	Re: BBC Oil Pump Recommendations I'd say good chance your crank is cracked and flexing,you said had about 15 runs on bearings,what was the old bearings like or was it first build? Your on the right track checking crank and line bore Mike Taylor 3601

07-19-2013, 09:18 AM	#10
Tgreen3724 Junior Member Join Date: Oct 2007 Location: Shepherdsville, Ky Posts: 38 Likes: 0 Liked 1 Time in 1 Post	Re: BBC Oil Pump Recommendations we took the whole thing apart this past winter and replaced the bearings. The bearings we took out looked flawless.