T15 is too small,T20 too big. What is driver for these bolts?

 

It's a specialized size.

proprietary.

 

Injector hold-down bolts are 8mm hex.

 

i wonder if he is trying to take the solenoids off the top might be confused as to which bolt is the hold down

 

I think rodney got it there Jim.

But yeah, the actual hold down bolts are 8mm like jim said.

I'm pretty sure he's trying to disassemble his injectors.

 

Look at this and tell us which on you are trying to remove

Click on the blue
TikiWiki : H.E.U.I Injector Disassembly and Assembly

 

Yea, the bolts/screws I was on were the solenoid cover screws. I'm not trying to dissassemble anything, just replaced glow plugs and was checking torque of rocker arm and injector hold down bolts(as per advice from you guys who are MUCH more knowledgeable than my humble self) Obviously I need to look a little deeper to check injector bolt torque. Thanks, guys. Oh,p.s. I believe that those solenoid screws are t15PLUS(never knew there was such a thing)

 

So now I'm on the right bolts, anyway. Lower ones were easy to check, and quite loose! got a full turn or more on all before wrench clicked. Solenoid and elec connector seem in way of top bolts. Looking at pictures in above link I don't think I want to remove solenoid while in truck? May be able to get a wrench on 'em and snug 'em up?

 

You don't need to touch the top bolt

 

You're torquing those in INCH/Lbs and not FT/LBs right?

 

Injector hold-down are 120 INCH pounds, or 10 ft pounds.
If you try to get them to 120 ft pounds they break way before then.
...So I'm told....

 

Torx Plus
When the original patent for the first Torx ran out in 1990, a new Torx version became available. These are called Torx Variant or Torx Plus. The design for these helped improve the torque capacity while lowering the incidences of wear or stripping of the Torx head. You can use a regular Torx tool for these but you won't be able to tighten it as much as it needs. A special tool is required if you want a tight fit. The driver sizing for Torx Plus is designated with a number followed by an "IP." These range from 1IP to 100IP. You will find pan head Torx, flat-head Torx and socket head Torx Plus. The pan and socket heads are the same measurements, with the flat-head only slightly bigger. 1IP for a for pan and socket heads is M.09 and the flat head Torx is M.9 and M1. The 100IP only has a 7/8-inch and 1 inch socket head and an M22 and M24 metric socket head. The "M" designates metric measurements.

 

Yea inch/lb. All done, valve covers back on. Parts just arrived from Guzzle, time for fuel bowl rebuild.