AintQik
09-27-2010, 11:01 AM
Pretty much know my way around an engine here but I have an issue, or noise that has me stumped and I wanted some outside input. I will say that I've never had a crank go bad so that may be why I don't know what this noise is.
I do realize its impossible to tell what any problem is over the interweb, but I am looking for some ideas of what could have gone wrong so I can troubleshoot them out before I tear it down.
Motor was is a 4 bolt 350 block that was built to run in a semi stock oval track class. Driver's kid got sick so we had a motor lying around with no home. It went in my 50 Chev P/U. Lots of good parts, buil tto take lots and lots of abuse. Unfortunately it lasted 17 miles.
Solid cam. Broke it in with regular oil. I know I should have used Rotella but its been working good so far. No, I mean zero issues with break in. Ran like a champ. Now on to issues...
Slight vibration noise was heard driving around town. Felt like something loose on the car, not the motor. Could feel it under slight load, a decent amount of rpm it went away. Figured something was not tight so I headed home. Noise got progressively worse. Sounded like a "growling". Wierd, still convinced it was something OUTSIDE of the motor. Oil pressure very good, temps good, at anything over 1500 rpm it goes away.
Get just about to the house and the fan belt comes off. Probably unrelated but I thought I would throw that in there. It was the first shakedown run, first time on the road outside of the hood.
I get it home and its still making the growling (even with the belts off so that rules out a bad water pump). Not a knock, def not in the valve train or a tap. When I shut it off it diesels a bit and sounds like its detonating. Hmm.
I thought I wiped the cam, but how could it run so well at rpm? If its going wouldn't I get a miss? I'll pull that first.
Next thought is the oil pump, its that kind of growl but why do I still have awesome pressure? I'll stick my primer in there and see if I feel anything.
Maybe a timing chain? But again, runs too dang good. Its a double roller, I doubt I stretched it enough to growl in 17 miles.
I'm betting its a main, but I have no idea what one sounds like bad. Plus I've always seen oil pressure fall off. None here and it still runs like a champ over 1500 rpm.
You guys have any things to check before I take it out? I'm in the military, have like 0 time and this thing was supposed to be done a million times. Its for my dad. Between me getting deployed and my bad luck he will only get to ride in it to his funeral. Man, I better not say crap like that.
rj
I do realize its impossible to tell what any problem is over the interweb, but I am looking for some ideas of what could have gone wrong so I can troubleshoot them out before I tear it down.
Motor was is a 4 bolt 350 block that was built to run in a semi stock oval track class. Driver's kid got sick so we had a motor lying around with no home. It went in my 50 Chev P/U. Lots of good parts, buil tto take lots and lots of abuse. Unfortunately it lasted 17 miles.
Solid cam. Broke it in with regular oil. I know I should have used Rotella but its been working good so far. No, I mean zero issues with break in. Ran like a champ. Now on to issues...
Slight vibration noise was heard driving around town. Felt like something loose on the car, not the motor. Could feel it under slight load, a decent amount of rpm it went away. Figured something was not tight so I headed home. Noise got progressively worse. Sounded like a "growling". Wierd, still convinced it was something OUTSIDE of the motor. Oil pressure very good, temps good, at anything over 1500 rpm it goes away.
Get just about to the house and the fan belt comes off. Probably unrelated but I thought I would throw that in there. It was the first shakedown run, first time on the road outside of the hood.
I get it home and its still making the growling (even with the belts off so that rules out a bad water pump). Not a knock, def not in the valve train or a tap. When I shut it off it diesels a bit and sounds like its detonating. Hmm.
I thought I wiped the cam, but how could it run so well at rpm? If its going wouldn't I get a miss? I'll pull that first.
Next thought is the oil pump, its that kind of growl but why do I still have awesome pressure? I'll stick my primer in there and see if I feel anything.
Maybe a timing chain? But again, runs too dang good. Its a double roller, I doubt I stretched it enough to growl in 17 miles.
I'm betting its a main, but I have no idea what one sounds like bad. Plus I've always seen oil pressure fall off. None here and it still runs like a champ over 1500 rpm.
You guys have any things to check before I take it out? I'm in the military, have like 0 time and this thing was supposed to be done a million times. Its for my dad. Between me getting deployed and my bad luck he will only get to ride in it to his funeral. Man, I better not say crap like that.
rj