Case Study # 327 - Phantom Knock - or its it DEADLY Knock ?
Originally Posted by cfdfireman1
Did you bleed the lash adjusters?
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From: 2003 Evo VIII - Silver
Originally Posted by scottatayamaha
I have had a problem with lots of valvetrain noise in my head after i installed some cams about 3 weeks ago. I have taken my valvecover off twice now to recheck the rockers and the cam bearing caps and they are all fine, i also check to make sure that there was not any uneven wear. I have a feeling that this sound is driving my knock sensor off the wall. Anyone have any ideas on what it could be.
A few things to check out
#1 - how is the wear on the cam journals ? Is it even - no scoring ?
#2 - Take off the cam gear and rockers and install the cam in the journals and see if it spins freeely
#3 - At same time plasti gauge the cam caps to see if there is a variation in cam journal clearance
I have found that bleeding the lifters is not really an issue provided you tighten down the head in a smooth and even fashion
Best of luck
Al
When you say tighten down the head...do you mean tightening down the cam bearing caps? I did not bleed my lifters...I did tighten down the bearing caps in order. But after driving the car around for a little i relized that i had set me torque wrench worng and had tightend the caps down to about 25pounds instead of 15 pounds...i went back in order and loosened the caps and then retourqed them to 15 pounds. Could this be my problem?? Also i spun the engine over with the crank when the valve cover off and the spark plugs out and it turned very easy and made no noises at all.
Originally Posted by scottatayamaha
When you say tighten down the head...do you mean tightening down the cam bearing caps? I did not bleed my lifters...I did tighten down the bearing caps in order. But after driving the car around for a little i relized that i had set me torque wrench worng and had tightend the caps down to about 25pounds instead of 15 pounds...i went back in order and loosened the caps and then retourqed them to 15 pounds. Could this be my problem?? Also i spun the engine over with the crank when the valve cover off and the spark plugs out and it turned very easy and made no noises at all.
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From: 2003 Evo VIII - Silver
Originally Posted by scottatayamaha
When you say tighten down the head...do you mean tightening down the cam bearing caps? I did not bleed my lifters...I did tighten down the bearing caps in order. But after driving the car around for a little i relized that i had set me torque wrench worng and had tightend the caps down to about 25pounds instead of 15 pounds...i went back in order and loosened the caps and then retourqed them to 15 pounds. Could this be my problem?? Also i spun the engine over with the crank when the valve cover off and the spark plugs out and it turned very easy and made no noises at all.
In my race car - I have swapped cams at least 35 times and i never once bleeded my lifters
The key is to tighten down cam caps evenly and smoothly
I would suggest you go back and re-read my suggestions above and try those check points out
AL
OK thanks Al, what is the best way to take off the cam bearing caps. Should i just put my engine at TDC and zip tie the timing belt to the cam gears and insert my tensioner tool and then in order loosen the cam bearing caps and take them off and inspect? DO i need to take the cam gears off of the cams to do this? I figured since i do am not removing the cams that i can just leave the gears on and have some slightly lift up the cam so i can inspect the lower journals. Also why i am in there is there anything i can do to get my lifters to quiet down? Thanks
Originally Posted by whitey4d
Probably so If u over tighten something it distorts it and cams arnt spinning free. u would have to take the T Belt off to check for cam binding. Also u wont hear ant noise just feel of uneven force to turn the cam over.
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From: 2003 Evo VIII - Silver
Originally Posted by scottatayamaha
Do you think that since i overtightened the cam bearing caps by 10pounds that it would cause my cams to bind up? I did tighten them evenly and in sequence just a tad too tight. I would understand maybe slightly starving them for oil. I did go back and retorque them back to 15pounds about 1 week later when i found my error. I really hope by overtightening them that i did not score my cam bearing caps. Although i do not know if i would be able to hear it like i do.
AL
Originally Posted by scottatayamaha
Do you think that since i overtightened the cam bearing caps by 10pounds that it would cause my cams to bind up? I did tighten them evenly and in sequence just a tad too tight. I would understand maybe slightly starving them for oil. I did go back and retorque them back to 15pounds about 1 week later when i found my error. I really hope by overtightening them that i did not score my cam bearing caps. Although i do not know if i would be able to hear it like i do.
You're fine.
10ft lbs. more won't distort your cam caps.
They just hold the cams in and by overtightening it by 10 ft.lbs won't crush it enough and bind your cams.
Say you did crush it, then you would've seen a problem the first 5 miles you drove.
Your cams should've locked up due to incorrect clearance and ruined your head.
.
Thats what i am thinking.....I am really paraniod. I was at Topspeed in GA on monday and Doug agreed that it was just my lifters. But damn my paraniod *** i still want to tear my head apart and recheck things.
Originally Posted by DynoFlash
I am glad that you are amused
Al
Al