i have a 77 silverado with a 79 suburban 454 motor...just had the lifters replaced when the guy replaced the lifters he also had to replace 8 pushrods because they were bent...truck hasnt run right since i got it back...skipping and now it has a knock in it...
2006-08-25 23:27:53 · 7 answers · asked by midnight_angel_1968_04 1 in Cars & Transportation ➔ Maintenance & Repairs
Push rods don't normaly bend. There had to be a "cause".
In otherwords, just replacing something without finding out what the initial problem was is asking for MORE trouble.
In order to bend a push rod there had to be an underliing problem.
A) Could it have skipped a tooth on the timing chain, or is the timing chain so streched out that it is changing the valve timing?
B) Was the engine over-speeded causing the pistons to impact the bottom of the valves?
C) Do you have a bent intake valve? Have someone do a compression test on the all 8 cylinders.
A ticking noise indicates upper engine. Sounds like someone tapping on the side of the engine with a wrench.(usualy durring idle)
A lower knocking sound indicates bottom end problems. ie; crank bearings, connecting rod. Sounds like someone pounding on the engine with a big hammer. (usualy under acceleration)
You need to have someone with a good "mechanics ear" listen to the engine.
Best of luck to you........
2006-08-26 00:16:48 · answer #1 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋
He may have adjusted the lifters to tight, and or their may be a vacuum leak at the intake manifold. As for the knock that could be carbon that broke loose ,which also depends on the type of knock, a deep throat ed knock could be a rod bearing, an upper knock could be carbon and or a lifer that didn't fill up with oil.
2006-08-25 23:46:54 · answer #2 · answered by milton s 1 · 1⤊ 0⤋
knocking is caused by bent lifters or rocker arms, check the oil in ur truck, it usally happens when there is no oil or not enough oil. and for ur ? about finding someone to fix it, any shop will, but goto a big name, like pepboys, or a big shop name u can find alot. if u live by any. IM me at zackattack081988 if ya need any more help.
2006-08-25 23:32:00 · answer #3 · answered by zackattack_1988 2 · 0⤊ 1⤋
the 350 is way inexpensive to construct, and think ofyou've got such quite some thoughts to get more beneficial overall performance. both will more beneficial healthful and bolt up. in case you do make certain to bypass with the 454 i ought to deploy new the front coil springs to make it holiday excellent.
2016-11-27 22:25:35 · answer #4 · answered by Anonymous · 0⤊ 0⤋
How can you afford to run a BIG BLOCK like that?
say goodbye and get a 350 motor
2006-08-29 21:11:57 · answer #5 · answered by quik1964 3 · 0⤊ 0⤋
chevrolet dealership. he may of used the wrong push rods. could of been to short or too long. there is several reasons why its acting like this.
2006-08-29 09:07:56 · answer #6 · answered by duc602 7 · 0⤊ 0⤋
what bent the push rods. sounds like u got more problems then he found. i think he screwed you.
2006-08-26 02:09:56 · answer #7 · answered by Anonymous · 0⤊ 0⤋