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| Wiped Cam Lobe? What are my options? (Page 4/7) |
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tnkgnr
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JUN 05, 08:28 PM
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| quote | Originally posted by StreetRod4:
Is the timing mark on the balancer jumping around when it's in diagnostic mode? I had a bad pick up coil in the distributor cause that before. And are you sure the noise with the engine off isn't the iac valve? |
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Hah - yea apparently it is the IAC (confirmed by unplugging). Does that mean anything?
The balancer is pretty steady. When I do the timing I use the ignition coil wire so it's showing the #1 and #4 back to back. Between the two about 2 degrees difference.
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tnkgnr
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DEC 31, 07:00 PM
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Took things apart after figuring out how to get the lower intake off. The cam lobes appear to be fine (roughly measured the high point of each lobe by using a pencil), as well as the lifters.
However, I figured out my #6 pushrod is bent. Is this a good candidate for my symptoms? I suspect maybe caused from excessive pinging when I had different injectors in. Anything else I can check on while I've got everything opened up? Any way to check if that valve is jacked up? Thoughts?
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La fiera
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DEC 31, 07:53 PM
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You probably revved it up with cold oil. I've done it before in my V8 days.
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tnkgnr
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DEC 31, 11:48 PM
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| quote | Originally posted by La fiera:
You probably revved it up with cold oil. I've done it before in my V8 days. |
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Is the fix as simple as just putting in new pushrods? Does a bent pushrod on the intake valve match with my symptoms of bucking during cruise?
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Pyrthian
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JAN 02, 01:51 PM
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| quote | Originally posted by tnkgnr:
Is the fix as simple as just putting in new pushrods? Does a bent pushrod on the intake valve match with my symptoms of bucking during cruise?
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if the lobe, lifter and rocker are fine - yes it is.
but, as to the bucking during cruise. another place this comes from is motor mounts. especially the dogbone.
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La fiera
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JAN 02, 03:34 PM
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Yes. Install the lifter, and new pusrod and rotate the engine and pay attention at how the lifter moves up and down compared to others. If it looks good zip her and you should be good to go.
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tnkgnr
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JAN 02, 05:42 PM
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| quote | Originally posted by La fiera:
Yes. Install the lifter, and new pusrod and rotate the engine and pay attention at how the lifter moves up and down compared to others. If it looks good zip her and you should be good to go. |
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Hmph...I installed the lifters and rotated the engine around. They all went up about 7mm as measured below (to include the one with the bent pushrod), except for the #5 intake valve lifter, which raised only 5mm.
 [This message has been edited by tnkgnr (edited 01-02-2022).]
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tnkgnr
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JAN 17, 04:59 PM
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Well - buttoned it all back up with the new pushrod. Happy it cranked back up with minimal effort (the most I've taken an engine down before), but still have the same bucking. Assume the 2mm less lift on the #5 intake lifter is my issue and a new cam is necessary. [This message has been edited by tnkgnr (edited 01-18-2022).]
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tnkgnr
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JAN 31, 09:49 PM
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Anyone have recommendations for a cam? I've got the 1.52 roller tip rockers and ported out the upper/mid/lower intakes (haven't touched the heads). I'm really just looking for something I can put in that maintains or improves the performance of the 3.4l without any additional expense (ie. machining the heads for better springs, etc).
Is this the one I want? https://www.compcams.com/hi...207-2-8-3-4l-v6.html
And then the act of changing the camshaft is just getting the timing gear off, distributor off, lifters removed, and just pull it out? Replace with new lifters and copious amounts of assembly lube, correct?
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tnkgnr
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APR 10, 09:41 PM
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New cam and lifters installed. Gave the engine a nice pressure wash. Anything else I should knock out while I wait for the timing chain cover gasket?
Obligatory photo in the engine compartment, with my helpers.
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