: 4.9 oil pump in 4.5



drewsdeville
09-28-10, 08:21 PM
I have a spare 4.9 oil pump on the shelf that I'm about to throw away. However, it occured to me that I might be able to use it in my own.

The 4.9 oil pump had benefits over it's predecessor including increased flow and pressure as well as reduced load.

I've had multiple pans off on various 4.9's and 4.5's, but for the life of me, I can't remember if the baffles are different. Does anyone know if the oil pans changed/if the 4.9's pump and pickup tube will fit in the 4.5's oil pan?

Sevillian273
09-29-10, 03:22 AM
http://www.cadillacforums.com/forums/ht4100-4-1-4-5-4/39064-4-9-oil-pump-4-5-a.html

No specifics on the baffles but if that dude says it fits then I'd be confident enough to try. I would bet that a 4.5 pan would fit a 4.9 if necessary.

creeker
09-29-10, 03:55 PM
Compare on rockauto.com and see if the part number is the same.

Sevillian273
09-29-10, 04:25 PM
Well you wouldnt want the part # to be same since the 4.9 pump is an upgraded design and the oil pan is a junkyard part. One thing I did notice while looking up the pump for my car is this:

"If screen assy. touches baffles in oil pan - oil pan must be replaced w/O.E. No. 3532055; Incl. screen"

^ Thats for a 90 seville. The 91 seville oil pump listing doesnt say that and the pump looks quite different.

drewsdeville
09-29-10, 07:26 PM
"If screen assy. touches baffles in oil pan - oil pan must be replaced w/O.E. No. 3532055; Incl. screen"

^ Thats for a 90 seville.

That's interesting.

Then I'm gonna assume that the 4.9 got a revised oil pan to fit the new pump. I don't have an extra pan laying around and I'm not going to buy one, junkyard or new, in order to replace a pump that already works fine.

The stock oil pump has been fine for 175k so it's still adequate. If I could have just thrown the updated pump in without any other changes, I might have done it.

shaagger
11-18-14, 01:01 PM
I know this is an old posting but thought I would give it a try just in case...........do you still have the oil pump and would you be interested in selling it?
thanks

ht4100
12-17-14, 01:31 AM
Shaagger and others, with the 4.9 pump discontinued(M182) you can use the M132 pump with the recommended size intermediate shaft, no issues with it's installation on my 92 with the 4.9 style pump and oil pan baffle.