Sounds like marbles
More Turbo
Joined: Mar 2004
Posts: 534
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From: manson
when I first read this I thought of the noise my truck makes from time to time....I only hear it when the truck is at idle and i am under the hood...drop three marbles in an empty metal coffee can and spin it around..that is what I hear....spray some wd40 on the belts and it goes away....Idler pully? PS pump? Water pump? Guess I won't know till something breaks 
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Elder User
Joined: Feb 2004
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From: Fort Rucker, AL
Originally Posted by michaelbrainardatwor
when I first read this I thought of the noise my truck makes from time to time....I only hear it when the truck is at idle and i am under the hood...drop three marbles in an empty metal coffee can and spin it around..that is what I hear....spray some wd40 on the belts and it goes away....Idler pully? PS pump? Water pump? Guess I won't know till something breaks
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Typically you want to make small changes in oil viscosity, and use the lightest that works good. You can scuff pistons with too thick of oil, as well as spin bearings on a cold day. But if your engine is old and worn out, a little thicker oil is just the thing.
More Turbo
Joined: Mar 2004
Posts: 534
Likes: 1
From: manson
My 2004 Baja boat with Mercruiser EFI 305 - 260 hp needs heavy oil. Mercruiser says to use straight 40w oil...or Mercruiser multi viscosity 15w40. Using synthetic will void the warrantee...Go figure. Tough...there is Moblie 1 in it. Oil is cheap...engine rebuilds are not. The Honda, on the other hand recommends synthetic oil...also requires a heaver oil. It gets Mobile 1 also. This confuses me considering these two machines typically run cooler than my truck, or any automobile for that matter. The Honda not only runs cool, but typically rich, due to the factory fuel injection mapping. I ran 20/50 in my Chevy S-10 for years ( summer time ). The 4.3l had 170,000 miles on it when I sold it and I know the guy I sold it to ran it well over 200,000.
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Elder User
Joined: Feb 2004
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From: Fort Rucker, AL
Well, I'm getting concerned, the more I hear the knocking, the more nervous I get. The engine is a new rebuild and I know the heads need worked. I'm going to try the 10w40 oil tomorrow and see what happens. When I'm at hot idle (just got home from work, out riding around), my oil pressure is 10psi. Maybe bringing up my pressure will help. Let me ask you this...IF this oil doesn't take away the noise, I'm going to drop the oil pan. What will I be looking/feeling for?
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Posting Guru
Joined: Aug 2001
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From: Evanston, WY
Originally Posted by WillyB
Why is the oil pressure so low? Was the engine assembled with the wrong main bearings? 10 pounds of oil pressure will cause knocks!
-Scouder
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Elder User
Joined: Feb 2004
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From: Fort Rucker, AL
Originally Posted by Scouder
Actually, from what I have seen on this and other forums, 10psi hot idle on an FE is not abnormal. The more important question is what is the pressure as the rpms come up to operating range, say 3000rpm? Rule of thumb is 10psi per 1000rpm.
-Scouder
-Scouder
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
I really still think it's rod side clearance. I would get a 15w40 instead of a 10w40, the 15w40 is diesel rated and is therefore a much more robust oil than a 10w40. It does other desireable things like keeping rings clean, cleaning sludge, has higher acid neutralization capability, and more anti-wear additives. Shell Rotella is a good oil.
My 360 idles hot with about 8psi, and I've never had a problem. Low oil pressure at idle is the norm for FE's with stock oil pumps. Doesn't hurt anything. If it gets below 5psi I'd get worried. You're probably losing pressure through the rocker arm assembly.
My 360 idles hot with about 8psi, and I've never had a problem. Low oil pressure at idle is the norm for FE's with stock oil pumps. Doesn't hurt anything. If it gets below 5psi I'd get worried. You're probably losing pressure through the rocker arm assembly.
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Elder User
Joined: Feb 2004
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From: Fort Rucker, AL
Originally Posted by rusty70f100
I really still think it's rod side clearance. I would get a 15w40 instead of a 10w40, the 15w40 is diesel rated and is therefore a much more robust oil than a 10w40. It does other desireable things like keeping rings clean, cleaning sludge, has higher acid neutralization capability, and more anti-wear additives. Shell Rotella is a good oil.
My 360 idles hot with about 8psi, and I've never had a problem. Low oil pressure at idle is the norm for FE's with stock oil pumps. Doesn't hurt anything. If it gets below 5psi I'd get worried. You're probably losing pressure through the rocker arm assembly.
My 360 idles hot with about 8psi, and I've never had a problem. Low oil pressure at idle is the norm for FE's with stock oil pumps. Doesn't hurt anything. If it gets below 5psi I'd get worried. You're probably losing pressure through the rocker arm assembly.