What is the part number for the "purple" service replacement #1 main bearing for the 4.9? I can't find it anywhere, or the TSB that lists it.
Night Wolf said:IIRC 1992 4.9 got rid of that problem.
Keep in mind, it will do NO damage to the engine, just be annoying...
but, it is the main bearing, all you gotta do is go do the dealer and tell them you want the updated main bearing kit ofr the 4.9... not sure on the exact name, but they'll know what you are talking about.
my 1993 4.9.....has never once had the knocking issue... I think it'll stay that way
Yeah, the new bearing went into effect for the 1992 model, although I *have* heard/seen 1992 Caddy's with the problem... and like you said, they were early production... engines left over from 1991 and put into 1992 cars.Capt Fiero said:Uh oh, if you are right, then I either have an early production motor, or some seriously bad luck coming up.
Thanks for the heads up on the bearing issue. I am going to keep a close ear on it to see how it goes or sounds for a while.Night Wolf said:OT... for the guys with 4.9 in the Fiero, do they know the coolant has to be changed every 2yrs/24k miles and the coolant supplement *must* be used? if not, they are in for an early death of the head gaskets and internal coolant leakage...
Mission Raceway Park. Link to Mission Raceway Park Rules PageNight Wolf said:What track do you run at that you can't run antifreeze?
a drag strip? hmmm... by us, they couldn't care less whats in the engine
Thats good about the coolant changes, I personally change mine every year, you mention 3 of the crushed tablets? the ones from the dealer? it is recommended you use all 5.
I have had people argue with me not to use that... ummm, just read the manual, look at the sticker on the freakin' car, and that stuff came in the engine when the car was new. the tubes of Barrs leak cooling system conditioner can also be used... it is the same exact thing, just crushed up, for the 4.9 you want 2 tubes.
I wish I could tell you more about what to look out for... but the 4.9 is so freaking Barr'sfreaking reliable, that there isn't any thing else when people ask me what the ain problems are with the 4.9, it is simple... rough idle, thirst for premium (not a single issue for me) and the cooling system maintenace..... and they don't take well to overheats, so first sign of the water pump going, replace it, if it does overheat, shut it down as soon as possible.
For being designed around 1982, the engine does a pretty good job at what it does, I would say it is a very good alternative to the Northstar, in the Caddy or the Fiero. I have a thing for old school push rods, not into the whole DOHC thing, so that is where the 4.9 gets a whole buncha brownie points in my book