I read a while ago someone used a different valve stem seal to try and make them stay on the guide better or seal better can't quite remember which and who it was.

 

Question 1.

What is the valve stem size on a 24v

 

Question 2.

What is the guide diameter where the stem seal sits

 

The reason for the 2 questions is I'm right now repairing a Perkins (POS) 4.4 RJ build in a JCB 416 loading shovel that the tip of number 3 injector dropped off, only the very tip below the injector holes so very small and luckily it imbedded straight away into the piston and did not go through a exhaust valve.

This has been ongoing for about a month due to being buried in work, the head has been on my bench for a couple of weeks after a skim waiting for me to grind the valves in, 1, 2 and 4 are ok but the fools that drive it ran it for over 3 weeks with diesel dribbling into No3, got the valves all done tonight as I've got a Cat 966 hitch propshaft to repair tomorrow and only one bench, dug the gasket kit out to get the stem seals and these things are rather good, they are all moulded onto the hardened washer that sits under the valve spring so they can never lift off

 

measurements are ID or valve diameter 0.350"  OD for the guide 0.500"  just checked a Ford 390 valve and it's the same diameter

 

JCB part number here is 02/203213   serial number is 0530400 for the machine

Here is the thread, started by @Dieselfuture, about the change in valve guide seals.

https://mopar1973man.com/topic/14508-top-hat-valve-seal-and-valve-train/#comments