Roller rocker adjustment???
Le Mans Master
Joined: Apr 1999
Posts: 6,134
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From: Raleigh North Carolina
Re: Roller rocker adjustment??? (Rhys)
Sounds like you may have narrowed it down....
So- you can now differentiate between the "knock" and the "tick".
And... assuming you loosened both I/E rockers so far that the valves were not opening at all... this would mean that the cylinder would not have fuel, and could not fire. At this point, the knock went away? No compression, no fuel, no down force on the piston... And... when you pull the plug wire, the same result... dead cylinder... the knock went away? This indicates a wrist pin or a rod bearing. My best guess given what you have said so far. Unless anyone else has more ideas, it's time to drop the pan and check the rod bearings.
Messing with the rockers "within range" (valves still opening & closing) would not have given you the same results... but taking them all the way out will make a diff, as you found out.
So- you can now differentiate between the "knock" and the "tick".
And... assuming you loosened both I/E rockers so far that the valves were not opening at all... this would mean that the cylinder would not have fuel, and could not fire. At this point, the knock went away? No compression, no fuel, no down force on the piston... And... when you pull the plug wire, the same result... dead cylinder... the knock went away? This indicates a wrist pin or a rod bearing. My best guess given what you have said so far. Unless anyone else has more ideas, it's time to drop the pan and check the rod bearings.
Messing with the rockers "within range" (valves still opening & closing) would not have given you the same results... but taking them all the way out will make a diff, as you found out.
Thread Starter
Platinum Supporting Dealership
Joined: Dec 1999
Posts: 6,425
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From: Traveling the US
Re: Roller rocker adjustment??? (Tom454)
Well, I took my intake off and found that the exhaust pushrod on #1 was damaged at the top. Nothing else is immediately apparent. I took the lifters apart and inspected the lifters. Both clean of any particles. I guess I will replace bothe lifters, rods and rockers on #1 cylinders and reassemble. If the knock is still there, it has got to be rod bearing or something in the cylinder.
My options then are: crate motor (ZZ4), short block only $1300, or rebuild current motor, or try to fix the one rod bearing.
Everything on the top end is brand new, so that is why I am considering a short block. Also I already have a 700R4 to put in. So if I do an engine pull, I will do the 700r4 also.
Any suggestions or comments?
[Modified by Rhys, 9:32 PM 10/20/2001]
My options then are: crate motor (ZZ4), short block only $1300, or rebuild current motor, or try to fix the one rod bearing.
Everything on the top end is brand new, so that is why I am considering a short block. Also I already have a 700R4 to put in. So if I do an engine pull, I will do the 700r4 also.
Any suggestions or comments?
[Modified by Rhys, 9:32 PM 10/20/2001]
Le Mans Master
Joined: Sep 2000
Posts: 9,078
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From: DFW TX
Cruise-In VII Veteran
St. Jude Donor '07
Re: Roller rocker adjustment??? (Rhys)
Rhy,
Did you pull the exhaust gasket on that side yet? That makes the same knocking noise. A rod bearing would not change like you described. It just knocks and knocks, no changes in sound. A broken piston pin, maybe.
Budman
Did you pull the exhaust gasket on that side yet? That makes the same knocking noise. A rod bearing would not change like you described. It just knocks and knocks, no changes in sound. A broken piston pin, maybe.
Budman
Thread Starter
Platinum Supporting Dealership
Joined: Dec 1999
Posts: 6,425
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From: Traveling the US
Re: Roller rocker adjustment??? (Budman78)
Well, I replaced my lifters and pushrods for #1 cylinder tonight, fired it back up and I have exactly the same sound.
Now I have got to decide if I am going to pull the motor or not.
Now I have got to decide if I am going to pull the motor or not.
