Author Topic: Cam wear/damage? (Read 1953 times)

Davez134 · « **on:** November 10, 2014, 05:00:28 PM »

I got a CB750 cam with some parts I bought, and I was wondering about the edges of these lobes. I have never seen this before, but then again I haven't seen a lot of cams.

The right edges of these lobes are raised up (or middle ground down? Depending how you look at it) with no other unusual looking wear. All 4 on this side of cam are like this, and all 4 on other side are completely smooth. Lift is same as other respective intake/exhaust lobes. Marking on the cam is "R3." Look like damage? Or an area not ground from casting?

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BPellerine · « **Reply #1 on:** November 10, 2014, 05:19:15 PM »

just looks like area where rocker did not travel,other than that looks okay.bill

goldarrow · « **Reply #2 on:** November 10, 2014, 05:26:07 PM »

The way I see it that cam is worn

Jerry Rxman Griffin aka MuthaF'er · « **Reply #3 on:** November 10, 2014, 05:36:53 PM »

get a new one!

MCRider · « **Reply #4 on:** November 10, 2014, 06:06:46 PM »

Quote from: goldarrow on November 10, 2014, 05:26:07 PM

The way I see it that cam is worn

...worn out. That ridge where the rocker didn't ride, should never show. There should never be that much wear to the lobe that that ridge would appear.

scottly · « **Reply #5 on:** November 10, 2014, 06:11:44 PM »

That cam is the poster child for Zinc additive.

MCRider · « **Reply #6 on:** November 10, 2014, 06:16:08 PM »

Quote from: scottly on November 10, 2014, 06:11:44 PM

That cam is the poster child for Zinc additive.

Ha, good one. Probably. I'd suspect some beginning wear on the rockers slap faces should be showing, too.

Davez134 · « **Reply #7 on:** November 10, 2014, 06:53:37 PM »

Thanks guys.

PeWe · « **Reply #8 on:** November 11, 2014, 02:56:17 AM »

Cam look bluish too. Running hot?
As said many times.... can be caused by the newer type of oils and/or blocked oil lines.

My old OEM cam that was used 65.000kms look new compared with this one. I did not change oil that often and the quality of the oil (often bubbling foam in the oil tank) was not good either which I noticed when the piston rings fell out in pieces when removing the cylinders 1983.

lrutt · « **Reply #9 on:** November 11, 2014, 05:57:06 AM »

yup, shot. No doubt running standard new era car oil.

Wonder what the trans looks like

Whaleman · « **Reply #10 on:** November 11, 2014, 05:58:04 AM »

Post pictures of rocker faces. I can't believe they are good. Dan

Old Scrambler · « **Reply #11 on:** November 11, 2014, 07:42:33 AM »

Dave acquired the cam in a parts-lot. Hopefully the other parts have some value...........this particular part used to qualify as 'land-fill' material...................but now we just re-cycle them to others.

Good catch, Dave. I would think the cam-tower and rockers associated with that cam are also worn beyond use.

goldarrow · « **Reply #12 on:** November 11, 2014, 08:41:36 AM »

use it as metal art project???

MCRider · « **Reply #13 on:** November 11, 2014, 08:59:35 AM »

Quote from: goldarrow on November 11, 2014, 08:41:36 AM

use it as metal art project???

I bagged that stuff up for a boat anchor.

Davez134 · « **Reply #14 on:** November 11, 2014, 09:02:09 AM »

Correct, I got this with other parts that I was looking for. No other associated motor parts with this to post pics of. I just wanted to know if it would be of any use in the future, but as I thought its trash. Using a Webcam on my current project.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #15 on:** November 11, 2014, 10:30:43 AM »

You could slide it under the seat of your car for possible protection against road rage.

754 · « **Reply #16 on:** November 11, 2014, 11:09:47 AM »

I have a 750 kicker under my seat...swing it around by hanging onto the rubber part.. Nasty..

edwardmorris · « **Reply #17 on:** November 11, 2014, 12:53:31 PM »

Quote from: Davez134 on November 11, 2014, 09:02:09 AM

.....I just wanted to know if it would be of any use in the future..........

Can be used as an exchange core for one of the hard weld megacycle cams.

Davez134 · « **Reply #18 on:** November 11, 2014, 01:00:44 PM »

Quote from: Jerry Rxman Griffin aka MuthaF'er on November 11, 2014, 10:30:43 AM

You could slide it under the seat of your car for possible protection against road rage.

Very good idea. I carry a concealed firearm, but honestly might freak someone out more by swinging a cam around!

dusterdude · « **Reply #19 on:** November 11, 2014, 02:56:00 PM »

Can it be re-ground?

Old Scrambler · « **Reply #20 on:** November 11, 2014, 03:04:56 PM »

Re-Grind...........Maybe...........if the journals are good.............but your looking at a few hundred bucks plus shipping............and you can usually buy for less (used or Cycle-X) if you are not looking for max-performance.

BPellerine · « **Reply #21 on:** November 11, 2014, 05:22:40 PM »

Quote from: Davez134 on November 10, 2014, 05:00:28 PM

I got a CB750 cam with some parts I bought, and I was wondering about the edges of these lobes. I have never seen this before, but then again I haven't seen a lot of cams.
The right edges of these lobes are raised up (or middle ground down? Depending how you look at it) with no other unusual looking wear. All 4 on this side of cam are like this, and all 4 on other side are completely smooth. Lift is same as other respective intake/exhaust lobes. Marking on the cam is "R3." Look like damage? Or an area not ground from casting?
guess I did not look close enough,or my eyes are failing!haha

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Author Topic: Cam wear/damage? (Read 1953 times)