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New oil pump seized


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Fired up my rebuilt 218 for the 1st time and  it was running real well with 35PSI oil pressure and then it quit.  I took the distributor cap off  and discovered the distributor was no longer turning, Took oil pump out and this brand new pump was seized and had a couple of teeth missing. What are the chances that the cam was damaged in the process? M

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the pump gears are designed to shear in this case and the cam teeth are not...they very robust.....this is also not uncommon....have seen the very thing you have experienced....even with priming the pump this can happen and am sure nothing you did inasmuch as lube.....now as in the last case I was involved in, the pump was warrantied and thus I was not able to open the pump to see if it ingested anything that aided in the locking of the pump....had to return the pump unmolested.  As an added, ensure the cam gear has no broken teeth still in the cam gears...this would be an instant repeat of sheared gears.

Edited by Plymouthy Adams
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The info you gave me has reduced the heart palpitations. I will remove the  oil pan and see if the teeth made their way down there. Is there any way to check for damage to the  cam once the pan is off.? Any preventative measures when installing the new pump? This has so far been a P in the cornflakes day  since the motor was firing flawlessly until the new oil pump catastrophe. To make matters worse my bleedin radiator sprung a leak. Daiquiris  on the porch may be in good order!

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you can easily inspect the cam gear through the oil pump hole and dropping the pan could well be prudent...the likelihood of a broken tooth entering the oil pickup with the screen in place very slim.  Odds are you know the tooth count missing, a magnet could likely retrieve these through the drain plug.  Any broken remains of teeth compared to the portion missing from the gear on the pump.  And, at having another issue spring forth (no pun) you may wish to take a minute to compose before tackling.  Not suggesting alcohol mind ya, coffee works well for me, but a bit of the hair of the dog may be in order...don't consume the whole dog.  

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I think this is the third one of those I've heard of happening in the last 2-3 years.  I wonder if the are the new rotor style or the older gear type?   and what is the brand?  

In the small tractor world I used to deal in a lot, the most common cause of hydraulic pump failure was blockage of the output flow due to no or defective pressure relief valves.  Wondering if the same could be true with these?   Plunger stuck due to some unknown reason?

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Posted (edited)

What was funny in my case, was that the oil pressure was 35 PSI and it ran flawlessly for about 7 minutes until the pump failed. Could it be the pump failed as the engine got hotter and seized due to expansion, indicative of improper tolerances during manufacture of the assembly? M

PS I molested my "new" oil pump and it was clean on the inside. It appears that the shaft seized. This was observed before I threw this fine assembly for a touchdown! LOL M

Edited by Marcel Backs
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your experience mirrors the last one I am familar with in person....happened to a fellow forum member that is local to me....he called me for guidance...he actually at the time had not discovered the oil pump had siezed....that was found immediately when I got there...first go to item.  

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Makes the hobby look like a game of chance LAME repoop parts and all! I am at an impasse on how to get a reliable oil pump which will not cause me to play a game of russian roulette with crucial parts which may be good or bad without the suppliers giving a damn while keeping their bottom line paramount.

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the parts available for these cars sometimes are questionable

bought pcs from parts guy that did not fit right

as able to combine new parts with old parts to make it work

i feel it might be best to look at regular autoparts stores before going to specialty parts suppliers

maybe cheaper price for same or better parts if they have them

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I have gotten to the point when I buy parts like master or wheel cylinders, oil pumps and the like that I take them apart and check everything. I have had bad seals, machine swarf, and parts that had hairline cracks in them.

 

Do not trust any part assembly any more.

 

James

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update on oil pump seizure: I took off the oil pan and had a look up at  the camshaft which looks unscathed with healthy teeth. I am trying to source a NOS oil pump from a auto parts store which has been around since 1925. I got lucky getting the proper 6v coil for my car there, so I may be lucky a 2nd time. It is fortunate that the oil pump gear was made with cheap scrap like the rest of the assembly and the missing bits found in the oil pan. WHEW!!!!!!

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