8n hydraulic pump blowed gaskets??DELL LOOK

Run a bottom thread tap into all four holes as far as it will go.

Inspect the bolts to assure the threads are not damaged or distorted.

Check the mating surfaces for distortion around the bolt holes in the pump housing especially and lapp as the other's have suggested on a perfectly flat surface with fine wet or dry sand paper.

Oil the bolts with a light oil before torquing. Not too much!

Torque to specs if you don't have a torque wrench in your elbow like I do. :O) I don't know the torque but somebody may be able to tell you???

My Boeing Engrs Handbook lists the torque for a 7/16 NF grade 8 bolt as 78 ft/lbs. Most N-Tractor 7/16 bolts are torqued 50 ft/lbs.

I would suspect that equal torque on all 4 attach bolts is desired to prevent the gasket from blowing out..... ..Dell

Just wondering.

Todd

I was involuntarily retired at 61 yrs, and allowed to keep my personalized engineering manual of FAQ's, stuff I constantly used in my job as an Flight Test Engr. It just happens to have a convienient table of torque values, I quoted it.

Zane asked if'n ennyone knew the torque value that his calibrated elbow tightened the hydraulic pump valve block bolts to. Of course you realize that there are many tables of torque values floating around the web including the one published by Society of Automotive Engineers.

Its also interesting to note that the N-Ford MPC specifically specified "hardened bolt". This was in the days of before grade 8.

You can tighten your bolts to any value you want if'n you think you know better..... ....respectfully, Dell

Jim

I'm in a predicament on my pump, as well. I took the pump base out and let it sit in Var-Sol for a day or so. Took it out and parts of the surface that the chambers mate to is ERODED. There were bits of gasket material left on there and underneath them was smooth metal, but not much. I was thinking about possibly JB welding that side (only one side is eroded) to fill in voids, or possibly hand filing that side until it is flat. There should be some clearance between the top of the valve and the bottom of the chamber, but is there enough to accomodate filing? Thanks.

Jeb2N

I think if you look around for that same thick black fiber gasket material and make the gaskets that little bit of pitting will be of no consequence(sp).

Jim