Offshoreonly.com - 454 Oil pressure question

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Full Force

10-10-2008 11:48 AM

Quote:

Originally Posted by PatriYacht (Post 2712145)

It's a good possibility that the engine was rebuilt with slightly larger clearences and just needs a higher volume oil pump.The Melling hv pump also has the bypass set for higher pressure than a lot of the Merc. original equipment. Unfortunately that means pulling the engine to check.

Thats what i did, I had .003 on mains 1-4 and .0035 on rear with standard pumps, not enough...

redstinger

10-10-2008 02:26 PM

Quote:

Originally Posted by daredevil (Post 2711558)

I think the press is to low for shure when hot.

The temp sender you put on the oilfilter ?!

Thats where mine is.

But not shure on a 330.

Also i would run 20/50 straight oil not synt.

Is their a plug on the remote oil filter housing somewhere where the sender goes?

Full Force

10-10-2008 02:55 PM

Quote:

Originally Posted by redstinger (Post 2712324)

Is their a plug on the remote oil filter housing somewhere where the sender goes?

There should be, what type do you have? or you can plumb it by the block adaptor, or in the block itself.

redstinger

10-13-2008 09:03 AM

ok I see where the plug is on the remote oil filter housing. easy enough. took the boat out today, cold pressure at 3500 rpm 50 psi. then down to 40 when hot, 10-20psi idle hot.

I'm going to just run it until it dies. Then it gives me a good excuse to go 496 or a new 502 block.

DareDevil

10-13-2008 09:26 AM

Sorry ,i did not get back sooner. But you found it.
Ithink its a waist of $ if you kill it.
Just rebuilt and beef up a little , can be done in 1 week and alot cheaper then new.

redstinger

10-15-2008 09:22 AM

Quote:

Originally Posted by daredevil (Post 2713957)

Sorry ,i did not get back sooner. But you found it.
Ithink its a waist of $ if you kill it.
Just rebuilt and beef up a little , can be done in 1 week and alot cheaper then new.

I hear ya, but pulling the motor is not a trivial repair. I've done it several times on my Chris Craft, so not afraid of it, but I think I'll try to get another season out of it, and then if i starting hearing noise or the oil pressure drops down further, then I'll pull it.

copiercat

10-15-2008 10:01 AM

so is it better to pull the oil temp reading from the filter, or like my set up has a threaded sender on top of the pan ?

redstinger

10-19-2008 08:25 PM

ok just put all new gauges in the boat. 30-40 psi idling cold.40-50 at 3500 rpm cold, but after it heats up, 40 is the max pressure, sometimes its 30 at around 3500-4000 rpm. needle fluctuates a little sometimes when idling. might give a new sender a try since it is 19 yrs old.

Jeff P31

10-19-2008 09:33 PM

Take the sender out and put in a real pressure gauge. If it still reads low put sae 40 and a bottle of lucas in it . I had the same problem with my 2550 at 250 hours . Sold it this summer with 750 hours on it and it's still running fine . Just my .02 :ernaehrung004:

Griff

10-19-2008 10:25 PM

I would definately verify the pressure readings with a mech guage before you pull the engine. Also, you need to run the correct that matches the guage you have installed.

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