Cam gear walking off?
- Thread starter fatty
- Start date
smokinVE
$$+VE=NO HP
With a VE powered truck and a big "drop" in cam I'd highly suggest using a degree wheel. As you know our injection rates suck hine tit, combined that with low rpm and a big cam that wasn't set up could be causing your egt and performance issues.
The valve lash backing off could be a number of things.
To me it sounds like you're fighting a few separate problems.
You mind giving a full run down of the entire power train?
The valve lash backing off could be a number of things.
To me it sounds like you're fighting a few separate problems.
You mind giving a full run down of the entire power train?
fatty
VE
Tonight I checked the rocker as BC847 suggested and the shaft and inside the arm looks fine. The part of the arm the rides one the valve looks just like the ones pictured above.
Also I cut open the oil filter and found some tiny silver metal pieces. Super tiny pieces, like I could barely see them against the filter "paper". There were maybe 30 or so total which seems like a lot, but not nearly enough for how much the valve lash changed. Also I checked the drain plug magnet and that had absolutely nothing on it.
Also I cut open the oil filter and found some tiny silver metal pieces. Super tiny pieces, like I could barely see them against the filter "paper". There were maybe 30 or so total which seems like a lot, but not nearly enough for how much the valve lash changed. Also I checked the drain plug magnet and that had absolutely nothing on it.
Texashighways
Comp Diesel Sponsor
it sounds like your cam is eating into the block due to lack of lubrication upon startup. Usually this additional lash will come into play in the first 100 miles. If you change oil at the same time you do the cam swap it will take additional time for the oil to hit the #6 bearing which is furthest from the pump.
Call the office if you need to go over any specifics. I hope I am not right.....
Call the office if you need to go over any specifics. I hope I am not right.....
fatty
VE
I used royal purple assembly lube and didn't let it fire until I had oil pressure. Shouldn't that have taken care of it? I'be driven about 50 miles since last set the valves and when I checked last night, they were all still right on. How fast will lash change if it is wearing into the block?
fatty
VE
Thanks Disturbed.
Stuffy and I pulled the engine from my 91.5 yesterday and I noticed that cylinders 2 and 5 had slight vertical scoring, just enough to feel with a nail. The drain plug was covered in metal and once I pulled the cam, looking through the LP hole, it looks like the cam journals in the block are pretty rough. Guess I don't know to install a cam. LOL
Weird thing is though, the cam itself looks perfect. No scoring or marks at all. I measured with a set of calipers and all the bearings are exactly the same size all the way around @ 2.125 IIRC. Must be a lot harder material than the block is. So I'm going to send it to Hamilton and see what he thinks. If it's still good I'm going to sell it to fund a new turbo.
Stuffy and I pulled the engine from my 91.5 yesterday and I noticed that cylinders 2 and 5 had slight vertical scoring, just enough to feel with a nail. The drain plug was covered in metal and once I pulled the cam, looking through the LP hole, it looks like the cam journals in the block are pretty rough. Guess I don't know to install a cam. LOL
Weird thing is though, the cam itself looks perfect. No scoring or marks at all. I measured with a set of calipers and all the bearings are exactly the same size all the way around @ 2.125 IIRC. Must be a lot harder material than the block is. So I'm going to send it to Hamilton and see what he thinks. If it's still good I'm going to sell it to fund a new turbo.
jimbo486
New member
All of the old lube oil pump part numbers more than likely have been superseded by the later oil pump. That was the case for me anyhow. I called Cummins for a replacement, gave the original number and got the number for the later, higher volume pump.
fatty
VE
Me too. I used so much RP it was dripping off the cam when I installed it.
Not rebuilding it. I bought a donor pickup and just going to use that engine.
Hey I'm trying to get ahold of you but your inbox is full. I refunded you, have you shipped my programmer back?
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fatty
VE
I used RP assembly lube and Delo 400 oil with Lucas additive that contains zinc.
EricStaab
Sponsor
Your cam assembly lube should be a paste. It should not run off the camshaft. It needs to stick to it. If it is running off or dripping it will not be there to do its job when it counts. Basically the cam paste is doing all the work before you have oil pressure, and also the first 30 sec to 1 min of running the camshaft doesn't see a lot of oil either. It is very important to use a good camshaft assembly paste. I also don't recommend any of the off the self Royal Purple products.
If anyone needs camshaft assembly past give us a call, and we can send you some. It is inexpensive. Also on break in you should have a very high ZDDP ppm content in your oil, and use a conventional oil also.
If anyone needs camshaft assembly past give us a call, and we can send you some. It is inexpensive. Also on break in you should have a very high ZDDP ppm content in your oil, and use a conventional oil also.