Magnetic Cam

I got bit by one of those. We'd sent the head off to the machine shop with the cams and all still on it. When it came back, I put everything together and got a cmp code from that bank. Scoped all 4 cmp signals and found that one cam's pattern was missing some activity. There was no getting the machine shop to own up to anything so we ate it. Lesson learned. When AllData has warnings about those…

So,as I disassembled the engine and laid the cams down, they touch each other. I wondered if this would damage them. As this was a donor engine for the block I'm not to concerned about them Now that I learned from others, I will make sure the ones in the other engine will never touch or get near anything.

There have been a lot of issues with them de-magnetizing. They cannot touch each other or be set on a metal work bench during service.

...and I have the old ones setting on a metal bench. I wonder how new ones are shipped.

The dealers are told to store them on a wooden bench... told being the key word there lol.

So is there a fix for this or just replace the cams, I have a 16 3.6 we dropped a socket and had to use a magnet at the back of the head and am worried we now have this problem

Hello. Could you supply the vehicle's details, please?

This engine was purchased from a junk yard for the block for a flood damage Jeep Wrangler. Air filter box had a clamp installed incorrectly and sucked water in.

I've updated your original message to include this vin/vehicle, which may come in handy later.

Hi Tom, thank you.

Could the cam be degaussed?

I wondered if they could be cleaned off and still be good, but with the amount off work it takes to install them I wouldn't use them again. All that metal is from the timing chain.

Yep, and those reluctors are notorious for slipping on the cam. If a dealer tech has a correlation code step 1 is to tear it apart and install timing tools. Super efficient, right? LOL FCA had to redesign the timing tools to fit into the reluctor in addition to timing the engine. The techs would tear it apart and confirm timing chains were good. Then it would get a PCM, then it would get torn…

Link to the previous discussion?

I believe its this one. diag​.​net/msg/m2u07ro3qw…

That seems like a really unnecessarily fragile system. Whatever happened to trying to build Robust components?

Well, we'd all be out of work if they actually built them to last!

They are using a magneto resistive sensor, no chunk of actual metal needed, just a magnetic strip. They are more accurate when they work, but reluctors can be an issue. The reluctor losing magnetic properties is a service issue only, far as I know. The real issue is engines that use a reluctor that looks like a seal, the 3.0 FCA diesel CKP for instance. The material is falling apart and the…

I completed the rebuild and have to say the engine with 30,000 miles had a good amount of metal stuck the the cams too. I didn't get picture of it as I already had wiped them off and hope they are still good. To prevent any damage to them I used the valve cover as trays and avoided a metal table. I wonder how this will effect motors with high mileage when it comes to sensor reading. I attached…