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Post by timss454 on May 11, 2006 20:40:58 GMT -5
I got a squeak in my LT1 , sounds like it is coming from the valve train , The engine runs great , Best running 350 I have ever owned ! It is an Iron headed 95 LT1 with around 70'000 on it , replaced cam, valve springs, valve seals ( LT4 ), timing chain , and gears,with different heads with some work done to them . When the car warms up and I drive it for a bit it starts a squeak, sound that is a bout a couple of seconds apart . I checked for problem bulletins and had come up with some information on the iron headed cars having problems with the exhaust guides causing a whooping or squeaking sound , which was caused by the exhaust guides running too dry . They had a part # for a seal to install only on the exhaust valves. I did this and about 40-50 miles on it , the squeak returned !!!! Every thing is oiling well up top , I am running 1.6 roller tip rockers and the exhaust valves rockers I removed seemed well lubricated . I wonder if this is what a roller lifter sounds like when its going south ? I don't wish this on any one, but I hope someone might have experienced this and can give me some incite , any help would be appreciated .....Tim
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Post by AAron on May 11, 2006 21:28:04 GMT -5
are you sure it is comming from the heads?
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Post by timss454 on May 12, 2006 8:02:52 GMT -5
I undid the main drive belt , I thought it might be the alternator, that wasn't it , I had one of those stethoscope things I used on it last fall before I parked it . I was using it and to tell the truth I never got an exact spot where it cam from , I quit messing with the stethoscope when I came across the Impala web site talking about the valve seals on the iron head cars being an issue making the whooping chirping noise . That is when I installed the seals. This is a transplanted engine I have in a 62 Nova convertible with a 700r4 , 9 " rear end ....Tim
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Post by Fire67 on May 12, 2006 8:34:00 GMT -5
Is the noise coming from the intake? Ive never heard of internal engine stuff making squeeking noises.
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Post by AAron on May 12, 2006 11:30:54 GMT -5
yeah that is weird there isnt much in an engine to make that noise. what oil are you using?
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Post by fast93z on May 12, 2006 12:33:42 GMT -5
Maybe a bad lifter not oiling the rocker enough and causing it to squeak?
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Post by timss454 on May 12, 2006 14:39:00 GMT -5
After breakfast this morning a good friend and I spent a few hours and re adjusted the valves thinking that maybe I had one of them maybe too tight , I reset all of them just like a normal hydraulic , I ran them 'til they clatterd then tightend them 'til they quit, then ran them down half a turn . After it really warmed up good it started again. I am about convinced that it is coming from the water pump , I am running a rebuilt cheapy and I just wonder if that bearing is going south and starting to squeak before it leaks and goes south ....Tim
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Post by AAron on May 17, 2006 22:41:14 GMT -5
could be.
did you take the belt off while it was making the noise?
ok after you turned off the engine?
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Post by 1bad2k2ta on May 17, 2006 23:05:09 GMT -5
could be. did you take the belt off while it was making the noise? ok after you turned off the engine?  |
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Post by lt1firebirdslp on May 18, 2006 6:06:36 GMT -5
i highly suspect power steering pump pulley or alternator pulley. New serpentine belt? Throw some belt conditioner grease (silocone lube) on your serpentine belt. Dont slab it on, use sparingly. If the squeak goes away might just be an old belt. If it doesnt I would be highly suspect of a pulley. One would suspect that a squeaking pulley would be a constant frequent squeak, but my buddys power steering pump pulley would squeak maybe every 5 to 7 seconds. Maybe it was just starting to get bad. We replaced that and it went away.
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Post by timss454 on May 18, 2006 20:06:40 GMT -5
I have pulled the belt , I felt it could be an alternator bearing ,unfortunately it kept on squeaking I felt it was coming from the water pump , 1 new water pump later and guess what , It happens after it is warmed up , its more of a chirping sound , I am Really getting frustrated with it and I am about ready to yank the engine. I really feel I have a valve guide squeaking when it gets warm or a roller lifter , guess I can tear it down and throw more parts and $$$$$$$ at it ........Tim
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Post by Fire67 on May 19, 2006 9:46:39 GMT -5
Well... the water pump is cam driven, so changing or removing a belt will not single that out, it would just eliminate the belt driven accessories. Id buy a d@mn electric water pump before I bought another stock replacement. I think the price diff is only like $50 and you eliminate the cam drive, pump bearings, and pump seals as a possibility.
Ive never heard of anything internal making a squeeking noise. Maybe a chirp but never an actual squeek.
I have however, replaced lots of altenators, tensioner pulleys, AC compressors, etc. because they all seem to have sh!tty bearings. Especially aftermarket replacement parts from Advance, AutoZone, etc... I now buy them with lifetime warranty's because they go bad so much. AutoZone has got to be regretting ever giving me the lifetime warrany on their altenators, I replace them at least twice a year.
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Post by timss454 on May 20, 2006 16:22:04 GMT -5
Well I tore it down , I had to know if was the lifters or not , I have had as long as the lifters didn't have a huge amount of miles on it you could reuse the roller style lifters , I somewhat reluctantly went on and used them with the new cam. Today I took the intake off and Guess what ! No bad lifters , all of the bearinngs are smoooth. I am now thinking towards possibly being a guide . These heads I bought with 500 miles on them and I was changing the valves anyway . When I tore them apart a couple of them had bent exhaust valves on one of the heads. When we ground the new valves and checked the seats the valves were seating centerd OK on the valve seats and they moved freely up and down in the guides and the guides had no unusual play . I am probably going to yank the heads next .... Just thought I would let you all in on the latest search for the squeak....Tim
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Post by 1bad2k2ta on May 20, 2006 16:35:23 GMT -5
Well I tore it down , I had to know if was the lifters or not , I have had as long as the lifters didn't have a huge amount of miles on it you could reuse the roller style lifters , I somewhat reluctantly went on and used them with the new cam. Today I took the intake off and Guess what ! No bad lifters , all of the bearinngs are smoooth. I am now thinking towards possibly being a guide . These heads I bought with 500 miles on them and I was changing the valves anyway . When I tore them apart a couple of them had bent exhaust valves on one of the heads. When we ground the new valves and checked the seats the valves were seating centerd OK on the valve seats and they moved freely up and down in the guides and the guides had no unusual play . I am probably going to yank the heads next .... Just thought I would let you all in on the latest search for the squeak....Tim Yeah, keep us posted. I love a good mystery. ;D |
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Post by timss454 on Jun 4, 2006 8:12:45 GMT -5
Well a few days and a few hundred $ later and I have discoverd what the problem was . I had about 5-6 Guides on each head were pretty bad shape , and the roller tip rockers were Gaulded and worn pretty bad .These were new out of the box !?! When I installed them I apllied a good grade of assembly lube in the rocker balls and pockets . The engine is oiling excellent up top , can't explain it . I did get the heads re-done nicely , 5 angle valve job , new guides , new stainless steal 1.6 roller rockers , all ready to go back together . I do have a Quick question , does anyone have a website that would show the torque steps and sequence for the LT1 heads , I had made a copy of the from a particular site last year and I can't find it . .......Tim
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