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post #1 of (permalink) Old 07-17-2003, 12:04 AM Thread Starter
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O/T-FSJ; AMC 360: low idle oil pressure like 258?

I've had to shift attention from my Scrambler to an FSJ w/ an AMC 360. Not much action over at FSJ board and I'm sure there are many SWB's who are familiar w/ AMC 360's and their quirks.

Per the OE gauge, my recently acquired '81 FSJ J-20 runs about 25psi at 40mph, but drops to '0' while idling at stop lights. Just changed oil & filter - 10W30wt. Odometer shows 85K miles. (Surplus vehicle from USMC via a public school system and Ryder. Looks like it was well maintained under the hood. Engine runs/sounds good; no 'odd' noises. Seems to have plenty of 'gitty up'.)

Is low oil pressure prevalent in 360s like it is in 258's?

Suggestions? I had planned on driving it about 650 mi (from VA to OH) this weekend.

Thanks!
R/

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post #2 of (permalink) Old 07-17-2003, 09:12 AM
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Re: O/T-FSJ; AMC 360: low idle oil pressure like 258?

I am not sure about the 258 but all the AMC V8s have an aluminum housing that the distributer, water pump, and oil pump goes into. Over time the aluminum wears out. I dont know if there is an easy fix or if you have to replace the housing. Maybe try running a heavier oil for a while like 20-50 and see what that does.
post #3 of (permalink) Old 07-17-2003, 10:12 AM
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Re: O/T-FSJ; AMC 360: low idle oil pressure like

It seems to be an AMC thing... and i do not understand. [img]images/graemlins/frown.gif[/img]

My Commando with a 304, has about 55 PSI at start up, and after it warms it drives around with about 25-30, and at idle, about 8, judging by the hash lines on the gauge. I talked about it with members in teh club, and it is just an AMC thing. Low oil pressure is just common, they will run fine like it. A guy in te club went through 2 or 3 rebuilt 360s in his CJ before he found one that kept some oil pressure, but the presvious motors were because of rebuild problems, not the natural low oil pressure. I changed over from the 10w30 to 40 wt. oil. And it seems to like it a bit more, but nothing dramatic. I also used the heavier oil to slow the oil leaks [img]images/graemlins/wink.gif[/img]

I would say just drive it till goes. Keep an eye on the gauge. As long as you have pressure when you are driving, you will be OK.

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post #4 of (permalink) Old 07-17-2003, 11:08 AM
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Re: O/T-FSJ; AMC 360: low idle oil pressure like

Ditto on the oil pressure problem. They do sell the new front covers now. You should have some oil pressure or it will be a problem. Someone out there used to resleave them to make them more durable. Pull the cover on the pump and the shaft and see how bad it's scored inside.
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post #5 of (permalink) Old 07-17-2003, 02:16 PM
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Re: O/T-FSJ; AMC 360: low idle oil pressure like 258?

My 258 has never had low oil pressure...Idles around 25-30... on the road it runs around 40...I wouldn't consider that low....oh well...just my .02 [img]images/graemlins/wink.gif[/img]
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post #6 of (permalink) Old 07-17-2003, 04:22 PM
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Re: O/T-FSJ; AMC 360: low idle oil pressure like 258?

You may want to try another sending unit or plug in another gauge to see if you are getting the same readings. It very well may be getting low but not as low as "0". An inexpensive check for piece of mind.

BTW, my 258 runs on the low side, too.

Scott
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