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new lesson

Post  Larry Williams on July 20th 2012, 7:48 pm

I learned something new today. When I started my new motor I had no oil pressure. after a few hours of wasted time and not wanting to pull the motor again it dawned on me. WARNING. do not mix up the lines to the remote oil filter it will block oil pressure.



whew.


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Re: new lesson

Post  jbozzelle on July 20th 2012, 8:43 pm

So, did it actually have pressure?

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Re: new lesson

Post  samiam on July 21st 2012, 10:12 pm

Cheap insurance,,,,,,,,, I have an old distributor that I removed the gear from and welded a 3/8 piece of round stock to the top, with a power drill ,I always pre-prime a new engine
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Re: new lesson

Post  Larry Williams on July 22nd 2012, 7:25 pm

i did prime it by hand both on the stand and before I installed the distributer then I removed the filter from the block and installed the remote filter. It showed no pressure on the guage till I discovered why
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Re: new lesson

Post  jmf32 on July 23rd 2012, 3:10 am

i also have a remote oil filter on my 460.
Just curious, what brand filter were you using when it happened?
Thanks for posting this.
The filter must have a check valve in it to prevent reverse flow

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Re: new lesson

Post  Larry Williams on July 23rd 2012, 8:20 am

i was using a K & N just for break in
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Re: new lesson

Post  bigblok2000ranger on July 23rd 2012, 8:30 am

I blew up a 302 back in the early 90's on my first V8 Ranger swap that very same way. Ever since I am super careful that the outlet line from the block adapter goes to the inlet side of the filter adapter. I was young and dumb and excited back then lol.

I believe it is actually the anti drainback valve that stops them from working backwards.
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Re: new lesson

Post  jmf32 on July 23rd 2012, 10:12 am

interesting,
reminds me of when i was blowing head gaskets at the dragstrip at half track.
i finally found that i pinched the fuel pump eccentric against the timing gear
3 head gasket changes later that is

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Re: new lesson

Post  lghting94 on July 23rd 2012, 10:53 am

jmf32 wrote:interesting,
reminds me of when i was blowing head gaskets at the dragstrip at half track.
i finally found that i pinched the fuel pump eccentric against the timing gear
3 head gasket changes later that is

Can you explain how this was causing head gaskets to blow???
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Re: new lesson

Post  jmf32 on July 23rd 2012, 11:47 am

yes, the gasket blew due to the fact that the engine was leaning out of fuel all at high rpms.

meaning aprox 4800 or more rpms

the fuel pump eccentric was bolted to an aftermarket timing gearset.

the timing gear set was a nice piece, multiple keyways to advance or retard the cam.

i still have it but i had to mill the face of the larger gear so that it would not squeeze against the eccentric that drives the fuel pump.

i believe that it was not designed to be used with a mechanical fuel pump and i did not notice it when i rebuilt the engine

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Re: new lesson

Post  rmcomprandy on July 23rd 2012, 12:58 pm

Reversing the lines to a remote filter won't show any signs of being wrong UNLESS the filter has an Anti-Backflow valve.

I have done simple oil changes in boats and on several new Mercruiser set-ups which inadvertently had the lines reversed originally from the boat builder, installing a better filter with an anti-backflow valve, shows that problem immediately
Took me a while to figure that one out; (how can just doing an oil & filter change cause and engine to have no oil pressure on just one of a pair of engines...?)

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