Break-in noise
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
Break-in noise
While starting my cam break-in I heard what I believe to be a rocker rattle. Nothing major
but if I remove the covers and find any loose rockers can I just tighten them up and be good?
but if I remove the covers and find any loose rockers can I just tighten them up and be good?
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Its somewhat common for a rocker to be loose after a new cam install. Maybe the lifter bled down. Maybe when you rolled the engine over to set the lash, the valve was just starting to open. You can rotate the crank in 90* increments while searching for a loose rocker. Just don't do this too much or you'll remove all the break-in lube.
Race Director
Joined: Dec 2004
Posts: 10,332
Likes: 63
From: PARADISE
St. Jude Donor '09-'11-'12-'13-'14
Re-lash the valves and run it again for another 10. It should not change significantly. Is it iron block and iron heads, iron block with aluminum heads?
Last edited by claysmoker; Nov 12, 2019 at 09:24 PM.
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Race Director
Joined: Dec 2004
Posts: 10,332
Likes: 63
From: PARADISE
St. Jude Donor '09-'11-'12-'13-'14
So set the valves cold at whatever lash the cam co. recommends. Run it for 10 minutes and check the lash hot. Should not change by more than a thou or so. With aluminum heads I set them about .003 tighter and they come out with the lash correct when hot.
What type rings? Molys are probably seated in the first few minutes of running if the thing is built correctly.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
In fact.....do not run the engine a lot until you get it under a load.....you can knock the face off the moly without properly knocking the peaks off the crosshatch and it may never seat in.....Ductile iron is much more forgiving for this.
You could load it against the converter if it is an auto, but it would take a lot.
Jebby
Last edited by Jebbysan; Nov 14, 2019 at 11:54 AM.
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
Since the car will not be road worthy in the near foreseeable future I assume I will have to wait to seat the rings. I have about 30 minutes at 2500+ rpm so far. So should I not run it until ready to drive? Thanks
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Breaking in new rings procedure has been the same concept for decades.
Find a really steep, long hill w/o much traffic. At the crest when ascending keep down-shifting. This forces the rings to brake the vehicle and draws maximum vacuum to remove gases. Do it twice. If not three times.
Last edited by HeadsU.P.; Nov 14, 2019 at 07:32 PM.
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
I understand the regular way which is why my thread was for a non drivable car. I have months of work before I can get it on the road. Just took care of most expensive part first which was engine rebuild.
Thread Starter
Racer
Joined: Aug 2019
Posts: 253
Likes: 24
From: Oklahoma
My a//t doesn’t shift right and stays in 1st which is why I didn’t want to drive it but if I can do the seating in low only I am listening. Can I just romp it on and off a dozen times and be done?