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-   -   Engine Knocking (https://www.ranger-forums.com/4-0l-ohv-sohc-v6-tech-33/engine-knocking-84970/)

KnightTremors 04-26-2009 04:58 PM

Engine Knocking
 
Ive been meaning to post this up for a little while but Ive just been trying to check a few things to rule a few things out.
Okay, Heres my deal. My 4L in my 92 Ranger is knocking. I have replaced one head (passenger side head) before the knocking started. I have driven it about 3000 miles after replacing the head and then it starts knocking. The Oil level is good (running 10W30) and the engine still runs very strong. I havent noticed a decrease in power at all since the knocking started. I havent tested the compression yet but I might do it sometime this week if you guys think I should try it.
What do you guys think could be knocking?

KnightTremors 04-27-2009 02:48 PM

Anyone have any Ideas????

elanalvey 04-27-2009 02:51 PM

read somewhere to try higher octane gas

does it only happen when you accelerate?

it also might be valve tap/valve lash

Downey 04-27-2009 02:53 PM

when you say knock i think connecting rods hitting off the crankshaft.

KnightTremors 04-27-2009 02:57 PM

Higher Octane Gas does nothing for it. It follows the RPMS but does it the loudest under a load. I dont think it is a rod because it runs way too good to have a bent rod.
I am thinking it may be a valve tap of some sort but not 100% if it is or not.

elanalvey 04-27-2009 03:03 PM

We Seafoamed the BII I'm working on and that cleared up about half the tapping. There's a thing on TRS to fix the tap. (If i remember correctly) You'd have to tighten the rockers.

Downey 04-27-2009 03:08 PM


Originally Posted by KnightTremors (Post 1309103)
Higher Octane Gas does nothing for it. It follows the RPMS but does it the loudest under a load. I dont think it is a rod because it runs way too good to have a bent rod.
I am thinking it may be a valve tap of some sort but not 100% if it is or not.

it doesnt have to be a bent rod the bearings could be laying in the oil pan like my s10s motor

KnightTremors 04-27-2009 05:48 PM


Originally Posted by elanalvey (Post 1309106)
We Seafoamed the BII I'm working on and that cleared up about half the tapping. There's a thing on TRS to fix the tap. (If i remember correctly) You'd have to tighten the rockers.

Hmm, Im gonna have to try and seafoam my engine then and see if that helps any. If not I guess I will have to see about tightening the rockers.


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