N14 Top End Knock

That's the sure way to find the problem.
My rebuild cost $11g in January.
N14 injectors and heads.
Good luck.

 

Cam follower failed then push tube dropped.

 

Could be as simple as new push rods. Could’ve gotten the cam and a set of followers.

If the blow-by /oil consumption was good I wouldn’t look toward an OH yet. Some of the old boys I’ve talked to, (not about your particular problem) have said the 855 and it’s predecessors wede bad about bending push rods and Wiping cam lobes.

When you get her back to the shop. Pull the rockers and Jakes and see what you got. If the followers look hurt/marked/ scratched/bent from the top side, pull the pan and check the cam.

I did basically the same repair on a 444 with aftermarket parts for @ $3500 in parts and about 5 cases of beer!! Jk, I ‘mean, @ 30-40 labor hrs. It was a slow diagnostic and a slower learning curve on timing it. None the less, 2 1/2 years later it’s still running strong.

 

You can just reuse the same number/type of gaskets if it’s just the follower.

If it’s the cam you’ll want to time it. You can buy the timing tool, their available. But I built one because I’m cheap and I only planned on working on one of theses! Basically I gutted a rocker box and bought a differential ring gear dial indicator kit. And bolted to the top of the rocker box so it’s solid And a scratch pad for the math. Worked well enough to make it run right.

 

Now that I think about it, I wasn’t able to just replace the gaskets because I could get the old ones separated enough to tell which ones they were. So I built the timing tool.

 

Yep, there was an extension kit I bought as well, I couldn’t find them locally so they became my first ever eBay purchase.

Basicly, if you have the two indicators and the extension kit. You need 2 - 3/8 x 1/4 thread brass air fittings. And two small pieces of flat iron, (I only used a mount and one plate out of the ring gear kit that I could have came around for less money).

Thread brass air fittings and 2 peices of iron 1”x 6”x 1/4” plate. Drill and tap one end to accept the brass fittings and you’ll have drill the other side (5/16”) so that the indicators will center up over the pushrod and piston when bolted down on top of your gutted rocker box. Bolt the rocker box down with a couple bolts and take your measurements.

The spring tension in the new dial indicator was enough to keep everything in line. If nothing else have a second set of hands holding a finger down on top of them.

 

Sorry didn’t see the last part of your post, no pictures with me, i’m Pretty sure if I dig down 2 1/2 years into the catch all drawer I’ll find the stuff tomorrow. Hopefully my description above is enough to picture it.

But I’ll try to remember, on a side note, I need to get a brake comparison chart posted on another thread!!