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| Erson cam walking bad but running good https://www.slantsix.org/forum/viewtopic.php?t=54979 |
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| Author: | 62 alum [ Fri Mar 28, 2014 9:49 am ] |
| Post subject: | Erson cam walking bad but running good |
This is a 1980 block that I put an erson rv 15 cam in. A used block but has good compression 135 to 140 My first shot at degreeing a cam but seems I did ok. Idles at 700 rpm with 18 to 19 ins. of vac. Now after about 1200 miles of trouble free driving I am hearing a noise coming from the front of the engine. Found that the cam gear had walked out from the block and is rubbing on the cover. Oh, also new timing chain and gears. Any ideas appreciated. |
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| Author: | Fopar [ Fri Mar 28, 2014 9:58 am ] |
| Post subject: | |
does it have the hole in the rear bearing part of the cam? If not oil pressure will oush cam forward. Richard |
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| Author: | 62 alum [ Fri Mar 28, 2014 10:30 am ] |
| Post subject: | |
Thanks for the quick rely. Your question also refreshed my memory. When I installed this cam 6 month ago I was not getting any oil to the rockers. I think it was Charlie S. post about the miss matched hole in the rear journal so I lightly grooved the center of it. This solved the problem but do you think it may have created the walking problem? |
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| Author: | Fopar [ Fri Mar 28, 2014 10:37 am ] |
| Post subject: | |
No there should be a hole lenght wise with the cam in the end. Richardl |
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| Author: | Exner Geek [ Fri Mar 28, 2014 10:42 am ] |
| Post subject: | |
No, there should also be a hole through the rear cam journal front to back to relieve any pressure build up behind the cam. It isn't uncommon to find cam billets that don't have all the holes they are supposed to have. I can't think of any way to check for this without pulling the cam out of the block so you might want to listen to any other suggestions first. Flat tappet cams are ground with a taper to the lobes that should cause the cam to be driven towards the rear of the block and it should not walk forward under normal conditions. |
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| Author: | 62 alum [ Fri Mar 28, 2014 11:18 am ] |
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Thanks to both of you. When I pulled the cam to groove it I never thought about checking the end of it for the relief hole. The car is not a every day driver and I am retired with time so I think I can pull the cam out without removing the engine. If the hole is not there any ideas on the size drill bit to use. It runs to good to quit now. |
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| Author: | xjarhead [ Fri Mar 28, 2014 7:07 pm ] |
| Post subject: | |
Would this help you, a cam stop? http://www.slantsix.org/forum/viewtopic ... &start=165 Dave |
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| Author: | DusterIdiot [ Wed Apr 02, 2014 6:32 pm ] |
| Post subject: | x2 |
I have done the cam stop on my engines as I have had cams walk because the bearing clearances were a little on the loose side and/or the timing set loosened up. One of the prime reasons to check your bearing and journal clearances before installing a cam, rather than swapping it out and hoping for the best. -D.Idiot |
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| Author: | 62 alum [ Thu Apr 03, 2014 9:42 pm ] |
| Post subject: | |
Update, l removed the cam to find that there was no bleed hole drilled thru the rear cam journal. I drilled a 1/8 in. hole thru it, reinstalled for the third time, added Doc's cam button, to the cover and times are good. Lesson learned, read every post on here before doing a job for the first time. Thanks to everyone for the info. 
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| Author: | olafla [ Tue Apr 08, 2014 12:27 pm ] |
| Post subject: | |
62 alum, I have an identical RV15 cam to install in my project engine, and I have read your thread with great interest. Quote: Thanks to everyone for the info.
Absolutely, but also thanks to you for the feedback, by updating us with your findings, and presenting your successful solution to a relevant problem!  Olaf |
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