69MustangCoupe393cid

Ok if you don't know already it's on my 2000 GT with 79k miles. The thing has had documented 3k mile oil change intervals since new and then nothing but Amsoil synthetic since 52k miles when I bought it. I have never had this happen on any car to me after an oil change this car included, so it has me scared. The car uses no oil between changes, it stays right up on the full mark.

I put in Amsoil 5w30 synthetic (took out Amsoil SSO 0W30 and it didn't do it when I put that in) and got a rod knock on startup for a half of a second. I filled the filter with oil before I put it on and I cranked the engine for 5 seconds or so before letting it fire. Now the oil to me seemed kind of thin when I poured it in, but maybe I'm crazy (I thought this before I started and got a rod knock). The engine is clean as a babies *** inside, no buildup, its silver not tinted like sludge or anything, you would think it has has 200 miles on it.

Could my oil pump be going, could I have a defective oil filter? Where and how are the oil pumps on these cars run? Just give me some input on this, am I worrying for nothing?

TOMMY01GT

I wouldnt worry, it just took a second for the fresh, thicker oil to pressurize the system, and you had a little lifter tick for a second...

I did an oil pump rebuild on an AMC 360 and it read 0psi for like 10 seconds until it finally reprimed and never a problem...

If you had a mechanical gauge, you would have seen a hesitation between the time your car started, and the needle coming off 0.

uberstang1

+1 it was probably just some valtrain noise while to system pressurized no big deal.

Blackvenom01

also once again no big deal...mustangs are noisy plus at an oil change kinda sounds like it was dry and then the pump sent fresh oil up to the valves...

69MustangCoupe393cid

I don't know, it really sounded like a rod knock but I guess I could be wrong, and I'm hoping I am haha. But I'm surprised it did that even with me filling the filter and cranking for a few seconds before firing. It's never done that before and I have run a 5-40 in this car before and it didn't do that. Hell I've never had that happen ever and I've done quite a few oil changes on a lot of different vehicles. Oh well thanks guys, I kinda figured I was worrying for nothing, but it just took me completely by surprise.

TOMMY01GT

rod knock is due to excess rod/crank clearance such as from a spun bearing, worn bearing, etc...its not a knock that goes away, once you hear a rod knock, you have rod knock.

TOMMY01GT

This, is rod knock

http://www.youtube.com/watch?v=pvm-tfF9Nd4

Jay-rod427

What he said ^^^. I wanna see you start a diesel truck at 0 degrees and listen to it sound like it's gonna explode for 15 mins!!! a half second of noise after an oil change... the sky is not falling it will be just fine.

KillJoy

Sure its the rod knock? I thought some 4.6s had timing chain tensioner noise on start up..

69MustangCoupe393cid

I know they have piston slap from what I hear, don't know about the timing chains

Yeah I know rod knock, I think I just freaked and it was really valve train, but still I never got it before with the many oil changes I have done on this car. I'm a sho owner and no stranger to rod knock, lost 2 sho engines that way haha.

Embed fail.

Rod knock... SHO style...

Link:

http://s34.photobucket.com/albums/d1...t=shoknock.mp4

See above haha. But as far as rod knock I agree but disagree. You can get rod knock with a failing oil pump, but with a replaced pump the engine could be saved. That was more my worry over truly worn rod bearings