Oil pump rod
Thread Starter
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Cross-Country
Joined: May 2019
Posts: 57
Likes: 3
From: SE Oklahoma
Oil pump rod
Changed oil pump on a 351w (1990 block) now drive rod will not mate up to distributor. It’s like it’s to short I can use a distributor out of a efi engine with no gear to prime oil pump but it has a 1/2 longer shaft below where gear goes. As soon as I switch back to short shaft distributor nothing.
Lead Driver
Joined: Jun 2013
Posts: 5,667
Likes: 1,159
From: Tolland, CT
If you think you ordered the correct oil pump, and in fact did receive the correct oil pump...you should call the place you got it from and see if in fact they sold you the correct part.
Please read the first couple of sentences in your post and see if they speak/read correctly.
Have you looked at the "related threads" below ?
Please read the first couple of sentences in your post and see if they speak/read correctly.
Have you looked at the "related threads" below ?
Thread Starter
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Cross-Country
Joined: May 2019
Posts: 57
Likes: 3
From: SE Oklahoma
Yes I looked at the threads only one was close to my problem but not the same. it’s like the spot for the rod is like deeper or somthing. iv checked the part number multiple times it says it it should fit. I Just don’t want to try to pull pump with engine in truck again pain in the butt since I can not get oil pan all the way out. I put drive pump rod in from top and it is engaged to pump. I can use a socket to spin pump and it registers pressure.
Lead Driver
Joined: Jun 2013
Posts: 5,667
Likes: 1,159
From: Tolland, CT
One of the experts should chime in soon. Good Luck.
I wonder if the auto parts store pumps in stock, if they could pull another pump and match it up to make sure your box had the correct pump in it.
I assume you bought your pump from a reputable place ?
I wonder if the auto parts store pumps in stock, if they could pull another pump and match it up to make sure your box had the correct pump in it.
I assume you bought your pump from a reputable place ?
Thread Starter
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Cross-Country
Joined: May 2019
Posts: 57
Likes: 3
From: SE Oklahoma
Distributor sets flush gear engages with cam truck will start and run. Just does not register on the gauge any oil pressure with this distributer. As far as pump rode did not have ring on it when I pulled it apart. I was starting to wonder about dash gauge but if I put socket and drill to rod it will work.
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Tuned
Joined: Oct 2013
Posts: 433
Likes: 95
When the distributor is out where is the pump driveshaft in relation to the pilot hole in block? You could measure down and compare to the distributor. Did you change pump because truck had low oil pressure?
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Joined: Jan 2001
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From: Virginia
Changed oil pump on a 351w (1990 block) now drive rod will not mate up to distributor. It’s like it’s to short I can use a distributor out of a efi engine with no gear to prime oil pump but it has a 1/2 longer shaft below where gear goes. As soon as I switch back to short shaft distributor nothing.
Thread Starter
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Cross-Country
Joined: May 2019
Posts: 57
Likes: 3
From: SE Oklahoma
I changed pump due to it having no oil pressure according to gauge at ideal and would start to knock slightly. Put it in gear and drive knock would go away and gauge would register pressure. Top of rod flush with pilot hole distributor shaft goes in. Like I say I can put a striped efi distributor shaft or Extension and socket on drill and it will register on gauge.
FTE Legend
Joined: Nov 2015
Posts: 30,917
Likes: 4,123
From: Angier, NC
So put the 2 distributors side by side bases matched up is 1 longer than the other?
If not look at the ends where the shafts fit is 1 larger than the other?
They are the only 2 things I can think it could be.
Dave ----
If not look at the ends where the shafts fit is 1 larger than the other?
They are the only 2 things I can think it could be.
Dave ----
Tuned
Joined: Oct 2013
Posts: 433
Likes: 95
Well it sounds like the shaft is engaging the distributor, you may just be spinning the shaft faster with the drill, the oil pump normally turns at half crank speed. If it is doing the same as before ,the pump was not the problem. Maybe worn out bearings.
Thread Starter
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Cross-Country
Joined: May 2019
Posts: 57
Likes: 3
From: SE Oklahoma
The efi distributor I use to prime is about a 1/2 longer but ends same diameter. No metal or any thing in oil but that does not mean any thing. Guess I’ll pull it and check every thing like I should have before I put it in. Thanks for all the help
FTE Legend
Joined: Nov 2015
Posts: 30,917
Likes: 4,123
From: Angier, NC
Could the EFI be from a 351 taller block and y I u have a 302 shorter distributor?
Dave ----