Wiped cam 86 B2000 2.0l

Sockeyehigh

1986 B2000 with only 14,000 miles on rebuilt motor and new head, Weber carb, headers.

Anyone have any ideas on how/why my cam has ALL the lobes wiped? Just one or two is one thing but ALL? Maybe the runout is bad? Also they are all off center as well leading me to believe maybe that’s the issue.

Oil: 10-15psi idle 30-40 cruising
Never overheated but did get semi hot a few times. Ran great, outside of a noise that cropped up that I could not figure out (turned out to be this). I replaced TB, tensioner and water pump and just finished a tune on it trying to eliminate what sounded like an idler bearing going bad. I’ve been hunting down a minor drivability issue for awhile, looks like I found it. It always ran good and most people would have never noticed but something was just not quite right.

I adjusted the valves numerous times this past summer trying to reduce the usual tic as well as normal maintenance. Never too tight, but looking at the cam it would seem like they were. I did have some trouble getting them adjusted and this possibly tells me why, but not why they were ALL wiped. When I pulled the valve cover last night to replace the gasket after my last adjustment in September, I grabbed a couple rockers just to feel movement and all was fine until… I noticed the lobes.

How the hell did my truck run so good with lobes soo bad? And outside of runout what would cause every damn lobe to be almost the same? Again, they were not too tight and I double checked my feeler gauges, even used brass feeler gauge this summer trying to eliminate anything giving me a false gap.

Oil pressure was fine, a tad low at idle but nothing I was worried about. There was oil sitting in the head where the lobes would dip into so I don’t think it’s an oiling problem but I could be wrong.

I’m a seasoned mechanic and owned a shop back in the day, but this has me stumped.

MazdaMitch

You say you adjusted the valves numerous times trying to get the noise out.

Is this all original?
The reason I ask is that if all of this is second hand to you and you dont know what the previous owner did, what has happened before is someone may swap the head or just the valve train and go from hydraulic lifters to the mechanical lifters that are adjustable, and in doing so they leave the 2.2 cam in place.
With the mechanical valve train you must use the 2.0 cam else you will never adjust the taping out of it. Some overdo the adjustment to get the noise out and a cam wipe 'could' happen.
You DID say you have a 1986 B2000 and that should be all mechanical setup, but how do you know it's not a 2.2 block with a mechanical valve train swap? That's why I ask if its all original or has it been tampered with.

Here is a video I did on adjusting the valve lash.
https://youtu.be/t8Fej8e5CsE?si=7hSWP4SAHZe7mVnT

Axel-Breaker-Earl

Yes....answer the questions that Mitch has asked please. Also, do you have any pics of the engine rebuild......as it was being rebuilt? Who rebuilt the engine......you or someone else?
The B2000 uses a different head gasket than the B2200......are you certain that the correct HG was used in the rebuild? The B2000 HG has a restriction built into the HG where the oil from the engine is sent up to the cylinder head.......the B2200 HG does NOT have a restriction built into the HG.......the required restriction is in the top of the block at the oil passage opening that sends the oil up to the cylinder head.