Well what started as a small knock is getting worse. It's only there at around 2000-2200 RPM. I have a mechanics stethoscope and it seems to be coming from the top end near the front. I know it's a shot in the dark but does this sound like anything that has been dealt with by anyone before I tear into it? Also the oil pressure is good and power is good too.
1997 FZJ80 Engine Knock
- Thread starter mtrdud
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- Thread starter
- #6
I checked the timing and it was 3* before TDC. I did mess with the timing and it seemed to subside as I went right of TDC. I didn't leave it there because I wasn't sure if this would be an issue. Does this make any sense ? It sounds like hell. I have a video I will post up later. BTW power and oil pressure is good.
Before tearing into it, take an oil sample and get it analyzed by some lab like Blackstone. They can tell you what part is most likely being destroyed. If in fact that is the case. That way you have a good guestimate what you are looking at to fix it.
If you think it is coming apart rapidly, old school people use to cut open the oil filter to see how big of chunks are floating around.
Your timing is right on if you used the jumper wire like the FSM requires you to do.
If you think it is coming apart rapidly, old school people use to cut open the oil filter to see how big of chunks are floating around.
Your timing is right on if you used the jumper wire like the FSM requires you to do.
If you search here long enough you will find all possible causes and possibly the videos to compare. I'd stop running it before it destroys whatever is making the sound.
interesting sound coming from the top end. i dont want to say rod knock right away but check your timing chain tensioner and guides. pull the valve cover and you will see most of the components.
- Thread starter
- #13
I recently did my oil pump cover. I know that the key was in place properly when I reinstalled the crank pulley but in theory if it wasn't could the pulley slip and throw timing off enough to lead to this ? I can adjust some of that noise out but the timing light them shows I am off.
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- #14
I just checked timing again. In service mode it is 3* before TDC. in regular it's about 4 or 5. In either when I rev it the timing shows more advanced. Is this correct? Is this a possible sensor leading to this? I had a CEL before and I unhooked the battery and it went away and hasn't returned. The only odd thing about this is that if I adjust timing the the "right" which I guess is retarded I don't get the knock at higher RPM'S. if this was a rod knock wouldn't it be constant either way??
Sounds like a rod bearing is hashed. Mine started with a light knock and and got louder over time too.
If you drain your oil I bet you are going to see/feel fine metal grit. The bigger pieces stay in the pan.
If you catch it early enough you might get away with just swapping in new bearings. I did it in mine, but the knock wasn't as bad as yours.
I hope I'm wrong, but it doesn't sound like timing to me.
If you drain your oil I bet you are going to see/feel fine metal grit. The bigger pieces stay in the pan.
If you catch it early enough you might get away with just swapping in new bearings. I did it in mine, but the knock wasn't as bad as yours.
I hope I'm wrong, but it doesn't sound like timing to me.
I'm going toward rod brg. Search here you can find that a rod bearing can get loose enough for the top of the piston to hit the head.
- Thread starter
- #19
That's sounds very possible. I'm not running it any more and I have run it very little since it got worse. I just don't have a whole lot of time to tear into it at the moment. Looks like it will be sitting for a while.
How did u make out?