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Ford 9N, 2N & 8N Discussion Forum

Oil pressure slow at start up

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Pincheweddo

02-25-2008 04:28:09

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I have noticed that the oil pressure takes some time to come up when starting. When the engine is cold or hot. The pressure has ranged from 30 (warm) to 50 cold. When the pressure comes up the engine tone changes slightly.

Start up is the most wearing part of engine operation so I am concerned.

1. What could be the problem?
2. How can the problem be fixed?

Thanks for your comments in advance!

Pinche

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TheOldHokie

02-25-2008 07:06:11

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Re: Oil pressure slow at start up in reply to BishopNsunset, 02-25-2008 04:28:09

Slow oil pressure buildup at cold startup is exactly the problem multi-grade oils are engineered to fix. Single grades can be overly viscous - even gelled - in cold winter temps and difficult/impossible to pump. If you are using a single grade SAE 30 or heavier and the temps are near or below freezing I'd suspect that first. Obviously experimenting with different grades of oil is a quick and inexpensive way to start attacking the problem.

I'm a bit skeptical of the idea that multi-grades are any more susceptible to losing prime in an N than a single grade. Did this problem not exist prior to 1960? If you are in fact losing prime it's not something to ignore. Dry running engines - for whatever reason - don't fair well in the long run. You've already been given a number of common failure modes for the N lubrication system.

TOH

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Joe T (CO)

07-23-2008 17:47:04

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Re: OT: Out of town ISP in reply to weaveman01, 07-23-2008 15:49:46

jon said: (quoted from post at 16:49:46 07/23/08) If any of ya'll travel with your laptop how do you connect to internet?

I've got an old laptop (ebay special) but it only has Win 95 on it & my Charter software disc only works with 98 & newer.

Can I sign up with some provider for a month? Only need about a weeks worth. Do any of the dial-ups still work with an old OS like this?

We just got back from a 4800 mile driving vacation. Every hotel we stayed in had free wireless internet. Most of them also had a ethernet port for folks that do not have wireless. It requires your NIC to be configured DHCP.

Does your laptop have a ethernet jack, it is a tad bigger than a phone jack. Their is usually a pamphlet with instructions.

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ZANE

02-25-2008 04:50:56

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Re: Oil pressure slow at start up in reply to Pincheweddo, 02-25-2008 04:28:09

If you are using multigrade oil in the engine that can be a problem with the N oil pump. The hot oil is so thin it won't remain in the pump enough to keep it primed.

Or the pump could need rebuilding. Or the pick up tube could have a leak in it allowing air to enter instead of oil upon start up.

Or it could as simple as the oil pressure gauge is slow. Oil pressure gauges have a restriction at the gauge that prevents the needle from fluctuating when running and that can cause slow to read on start up.

The fact though that the engine changes sounds when the pressure comes up sounds like something needs to be done to correct the problem before damage to bearings is done.

Zane

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