Bent push rod?
Thread Starter
Instructor
Joined: May 2006
Posts: 228
Likes: 0
From: Washington IL
St. Jude Donor '07
Bent push rod?
Since I bought my car this summer I have noticed a clicking noise while driving. It varies with engine rpm, and seems to be more audible between 1-2k. It isn't THAT loud but I can hear it from inside. When I get out to listen with the hood up I hear nothing. It seems to go away under 1k.
If it was a bent rod would it always make a noise, and would I definately be able to tell with my head under the hood? Would it be more pronounced, or at least still audible, at idle? I haven't had any problems with the noise so far, but I've just been curious.
Thanks guys
If it was a bent rod would it always make a noise, and would I definately be able to tell with my head under the hood? Would it be more pronounced, or at least still audible, at idle? I haven't had any problems with the noise so far, but I've just been curious.
Thanks guys
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I would pull the valve covers and take a peek. Also, the rockers sometimes spit out their bearings which could also cause the noise. Bent pushrod usually happens from an over rev.
Racer
Joined: Nov 2005
Posts: 419
Likes: 14
From: round rock tx
I hit the rev limiter on 3rd and when instead of shifting to 4th, somehow I shifted to 2nd; now the engine shakes and and it sounds like it's breathing real hard like having asthma; there is no clicking sound and the check engine light is on; after talking to Texas Speed, they told me it's more likely a bent pushrod so I went ahead and bought a head and cam package from them with all the accessories;
Intermediate
Joined: Mar 2005
Posts: 43
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From: Boise Id
I just finished replacing all the pushrods in an 01 M6 that was over revved too many times on the dyno. At first we heard just a click so we checked it out and found one rocker looking like it was off a bit and that one had a bent push rod. Put it all back together and ran it. After that we had the same noise you discribe. Only can hear it inside the car. So I pulled all the pushrods and found 5 more bent. The car ran fine, just a little noise. IT is an easy job to check it out.
Thread Starter
Instructor
Joined: May 2006
Posts: 228
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From: Washington IL
St. Jude Donor '07
Does anyone have a more detailed procedure? I'm assuming you have to take off the lifters and then just pull the rods... but isn't there more to torqueing them back on as far as which ones to do when?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Yes there is. Also, make sure you keep things in order (where they came off). If someone doesn't post it, I can get it later when I get home. Basically, you torque the ones that are on the base circle, rotate the motor 360 degrees and do the rest. Make sure you use a six point socket, not a 12 point. A lot of guys have rounded off the rocker bolts using a 12 point.
New pushrods should be thorougly cleaned inside and out and then put in oil prior to installing. I also use Redline Assembly Lube on the top of the pushrod and valve stem to ensure there isn't a dry start.
New pushrods should be thorougly cleaned inside and out and then put in oil prior to installing. I also use Redline Assembly Lube on the top of the pushrod and valve stem to ensure there isn't a dry start.
Le Mans Master
Joined: Feb 2006
Posts: 5,267
Likes: 40
From: Phoenix AZ
If you find any bent pushrods, make sure you check the rocker arm for side play. The caps that hold the needle bearings will get pushed out. I just tapped mine back in on the vice.....carefully. Woulda coulda shoulda taken pics.
