Cam Bearing Replacement

[Buckwheat]

The result of poor maintanence

The lifters & cam lobes are splash-oiled, so you won't see nuttin squirting out there under pressure. The comment about spinning up the pump I totally agree with - it really is only useful for pre-oiling after a rebuild. All that visible coke build-up is from poor maintenance by POs. The cam is junk but Delta Camshafts - see their website - can weld it & cut your chosen profile (they have something like 2 dozen just for the 2F) & resurface your lifters, less shipping for something around $150. I think many of the sellers are using them for their regrinds, based on the discussions I've had with them & the specs they gave me. I have been researching this for some time & have gotten down to them & MAF's billet, which is $300+, and shipping. I am still waiting for an email from them with a quote for everything. Downey was no help & their cams are regrinds. SOR has new OEM but only regrinds for RVs. Pull that block & send it to the machine shop for hot-tanking & cam bearings. You might as well get the telescoping gauges & measure the cylinders because the piss-poor prior maintanence indicates you may need them machined. Do not trust the machine shop on that because they love to sell machine work @ $30 to $60 a cylinder. Measuring the cam bearings is a good exercise but based on the wear on that cam, you are going to need them. Never reuse lifters unless they are machined!!

 

[JRFJ4-]

Lifters

You need new lifters with the new cam.

The main problem with installing the cam bearings is that every bearing has to be lined up and driven through every cam journal. So the last bearing will have to go through all the front five journals and then set in the last one.

Most folks that try it say that the new bearings they put in look much worse than the ones they took out. These are good mechanics.

The guys at the machine shop have just done it alot.

JR

 

[grant5127]

Don't do it yourself.

If it's like a Chevy, that's where oil pressure is made.

JR

Not so much as where it is made.. but where it is lost to the top end..

 

[captain_morgan]

I was doing the oil pump test to make sure that the pump was working. While the engine was running, I had the head cover off several times, to adjust the backlash of the valves. That's when I discovered that there was little oil getting to the head.

I didn't think of the fact that oil travels up through the holes until after I put the post up, and I forgot to change it... sry for the confusion.

What about the bearing surfaces on the cam? There were several black marks on them, Do these need to be resurfaced?

Does anyone think that my theory holds?

When the engine is running, it sounds like a diesel and all the noise is coming from the cam. I know, for a fact, that it's not coming from the lower end, or the top end because I checked it with a stethoscope. It was loudest along the cam.

I spoke to the guy that rebuilt it, last night. He said that the engine was given an overhaul using the CCOT kit. Back then, it didn't include some of the parts that it includes today. They changed all the bearings on the lower end, but not the cam, because the kit didn't come with new bearings. They also changed the pistons. Back then, the cylinders were still way in spec. That was about 2&1/2 years ago. Since then, it was driven for about a year, for maybe 5000 miles, until the oil situation got so bad that it was eating up pushrods. At that point, I parked it in the back yard and covered it with a couple of tarps. The guy that had it before him is the one responsible for the piss poor mainenance. Some people should be taken out in the woods and beat with a garden hose.