Knocking, after exaust up grade.
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Junior User
Joined: Apr 2003
Posts: 72
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From: Mtn. view CA
Knocking, after exaust up grade.
I just got my truck back from the shop, I had some new mufflers tips and an h-pipe put on it was running great then on a shot trip out of nowhere the engine started to run very rough I gave it gas and it shook even harder, thankfully I was'nt far from home so I was able to let it idle the way back. The engine is hard to start now and there is a noticible knocking coming from it; did I blow a push rod, it has been making a ticking noise from the left side for some time now; did the exaust have any thing to do with its suddent demise or is it something simple? Any help would be appreciated.
The engine is a 69 360 c6 tranny with an msd 6a other than that its stock
There was a valve job done on it about a year and a half ago
The engine is a 69 360 c6 tranny with an msd 6a other than that its stock
There was a valve job done on it about a year and a half ago
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Junior User
Joined: Apr 2003
Posts: 72
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From: Mtn. view CA
I probly should have changed the timing chain when I bought it, from what I read here on the posts it sounds like a good idea when in dought. Is there a way to check as to if it were the chain or rod
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
For a quick check...........pull cap and see if rotor is pointing to #1 and pointer is at TDC. If there is any chance it jumped, this will show it (you'll need to make sure it is on compression stroke first).
Being hard to start kinda puts you to mind that timing is advanced. Need to put pull valve cover and see if a pushrod jumped.
Larry
Being hard to start kinda puts you to mind that timing is advanced. Need to put pull valve cover and see if a pushrod jumped.
Larry
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Junior User
Joined: Apr 2003
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From: Mtn. view CA
Well I pulled the valve covers and only #1,2,5,6 cylinders rockers are moving while #3,4,7,8 dont move, it apears I now have a four cylinder truck, I think I twisted my cam.
Should I rebuild or try and find a crate motor?
Should I rebuild or try and find a crate motor?
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Have you tried to pull the pushrods on the cylinders that aren't working. That kinda sucks man.
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Junior User
Joined: Apr 2003
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From: Mtn. view CA
No I just saw that they wernt moving and, called it quits for the day, dint know what else to do. Do you think there might be a chance that its just the push rods? What should I look for?
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Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
You have a weird problem man. I am afraid ot guess but I would start with the pushrods. If they aren't severely bent then I would pull the intake and start looking at lifters. Keep in mind that if you have only cranked on the engine for a little bit the lifters might not have oil to pump up and that would make it look like the aren't working. How long did you crank on it or was it running? Does the oil pressure come up?
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Junior User
Joined: Apr 2003
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From: Mtn. view CA
I had a friend crank it while I watched, it cranked for about 20-30 seconds but dint start the battery ran out of juice, maybe I'll recharge and try stating it again. The oil presure dint come up, but before this when the engine was warm the presure at idle was always low but as soon as it got a few more RPM's presure went up, I always thought it was the gauge being inacurate (its the stock one) Can a worn out oil pump cause the cam to seize?
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
It oils from the front to the back(starting from across the top of the cam). Once it oils the cam, it goes to the crank area. If you hurt the cam from lack of oil, the crank/rods will be hurt too.
I would pull the cam and see what happened. It is pretty rare you break a cam like that(while in the block). They are brittle cast iron, but you need to really shock it to break it.
If none of the rear rockers are moving, I dont think it is just lack of oil pressure. They would move some, even if they did lack oil pressure.
Can't say I have ever heard of this one before.
Larry
I would pull the cam and see what happened. It is pretty rare you break a cam like that(while in the block). They are brittle cast iron, but you need to really shock it to break it.
If none of the rear rockers are moving, I dont think it is just lack of oil pressure. They would move some, even if they did lack oil pressure.
Can't say I have ever heard of this one before.
Larry