alk1174
Well-known member
- Joined
- May 22, 2020
- Member Number
- 1207
- Messages
- 125
TLDR version
83 22r 15 year old jasper reman with less than 30k. Has a tick at low rpms that seems to fade out as rpm rises. I am 90% sure it's timing chain related but what else should I check before I pull the motor.
What I have already checked.
compression test in spec and even across cylinders
valves adjusted
timing chain guides visually inspected from above and below and look good
oil pump replaced
rod and main bearings checked and plastigaged and in spec
all accessories water and fuel pump eliminated
Put a stethoscope on it and it seems like it's coming from the front of the motor but the noise is definitely carrying through the engine
Long version
After a long high rpm assault on an obstacle I developed a knock on decel. Pull the valve cover and oil pan and could not figure it out. Could mimic the knock by hand rotating the crank. Pulled the motor and found three flywheel bolts were very loose. The flywheel would rock side to side and make a knocking noise. After pulling the flywheel and putting the engine on a stand I could no longer mimic the knock. Figuring I had found the noise I decided to check the crank bearings and refresh the main seals, oil pan, intake, and exhaust gaskets new oil pump do an egr and vacuum delete and put it back together. Got it back together and it fired right up and the knock was gone but now has a tick at low rpms.
more clues
In the oil pan were some pieces of black sealer that had hardened and cracked and fell in to the pan. Also a sliver of thin magnetic metal was in the pan likely from one of two failed fuel pumps. Not sure where else this would come from as all crank bearings were in great shape. During all of the diagnosing the engine was also spun from the camshaft, could this damage the tensioner? At this point I plan to pull the motor and likely replace the entire timing set with an oem set but wanted to get any second opinions. My guess is the chain tensioner is either bad or clogged with a piece of trash.
Video coming soon.
83 22r 15 year old jasper reman with less than 30k. Has a tick at low rpms that seems to fade out as rpm rises. I am 90% sure it's timing chain related but what else should I check before I pull the motor.
What I have already checked.
compression test in spec and even across cylinders
valves adjusted
timing chain guides visually inspected from above and below and look good
oil pump replaced
rod and main bearings checked and plastigaged and in spec
all accessories water and fuel pump eliminated
Put a stethoscope on it and it seems like it's coming from the front of the motor but the noise is definitely carrying through the engine
Long version
After a long high rpm assault on an obstacle I developed a knock on decel. Pull the valve cover and oil pan and could not figure it out. Could mimic the knock by hand rotating the crank. Pulled the motor and found three flywheel bolts were very loose. The flywheel would rock side to side and make a knocking noise. After pulling the flywheel and putting the engine on a stand I could no longer mimic the knock. Figuring I had found the noise I decided to check the crank bearings and refresh the main seals, oil pan, intake, and exhaust gaskets new oil pump do an egr and vacuum delete and put it back together. Got it back together and it fired right up and the knock was gone but now has a tick at low rpms.
more clues
In the oil pan were some pieces of black sealer that had hardened and cracked and fell in to the pan. Also a sliver of thin magnetic metal was in the pan likely from one of two failed fuel pumps. Not sure where else this would come from as all crank bearings were in great shape. During all of the diagnosing the engine was also spun from the camshaft, could this damage the tensioner? At this point I plan to pull the motor and likely replace the entire timing set with an oem set but wanted to get any second opinions. My guess is the chain tensioner is either bad or clogged with a piece of trash.
Video coming soon.
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