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I've been reviewing the video of my test trip and I notice that the jakes shut off properly when the RPMs are 1500 or above, but when the RPMs are less than 1500 I get the hesitation for the rear head to shut off. The manual button on the solenoid never stuck in the down position so I'm leaning...

Thanks for the compliments - much appreciated. I know before the surgery on the hood was a big deterrent to quite a few folks but the hack & whack on a valve cover is far less scary. I imagine M818s are more likely to need jakes than cargo variants like mine, but my jakes are mostly for fun...

So on my setup LO is front and rear heads and HI is all 3 heads. Since I wanted to use a rotary switch that limited me to 2 circuits versus the 3 circuits that a jake specific toggle switch would give you. Since others have said 1 jake head doesn't do much I didn't feel bad skipping that one...

I took my Jake-equipped M813 out for a test run yesterday and it was sweet! The LO and HI work very well and it's not too loud with my H-161 headset on :) My issue with the rear head not shutting off immediately has returned so I'm going to look at the inner springs on the control valves for...

I turned on the power (12V) and I took the test light to each power junction in sequence to make sure each leg of the circuit was sound before I let the voltage flow to the next point: battery ‐>relay->clutch switch->throttle switch->rotary switch->LO circuit->HI circuit. No smoke escaped and...

Well, the jake brakes are now wired up and ready to get tested. To see the full wiring details go to my other thread here: https://www.steelsoldiers.com/threads/trick-functional-jake-brake-grenade-shifter.189934/page-3#post-2274120 For now, here are some finished pics!

The wye connector handles the LO setting (front & rear heads) so one wire loops back around and joins up with one of the HI wires and same with the front head. I'm really impressed how the male rubber cover worked out! Looks very clean and pretty close to what factory wiring could've looked...

I finished the wiring from the firewall to the jake heads today! I made some 10 ga. standoff brackets welded to 1/4" thick spacers to hold the wiring along 4 valve cover bolts and used flange head bolts to attach. Under the first bracket is a 3/4" and 5/16" p-clamps to hold the wye connector...

Actually, when bleeding them I noticed the center one sounded different than the front or rear (higher pitched). I figured it was to do with the firing order but with 1-5-3-6-2-4 it looks like the 1st head (1 & 2) have three cylinders firing between them, the 2nd head (3 & 4) have two...

I would like to have a spare solenoid if you round one up sometime. I was able to get the rest of the air purged out and now all 3 Jakes function as advertised :) All 3 valve covers are bolted on and I just need to reattach the draft tube, the filler cap chain, and the wiring brackets I made...

IN

That's good to know. Do you tend to turn them on after sitting and get them primed so that they're ready when you really need them?

I'm using 12v solenoids powered from a drop wire? from the 12 volt post.

I watched my short video again and the #5 was pumping out air bubbles from the control valve drain so there is still trapped air in there. I have yet to rev up and then engage that brake - I've only been playing with it at idle so I'll bleed it some more this afternoon and see if I can purge...

Good update! I fired up the engine and it runs normal just like it did before and no leaks anywhere so my overhead and rocker box work were a success! I bled out the solenoids on the jake heads and the rear solenoid will continue to activate the jake mechanism for about 4 seconds after I...

Mucho progress this morning! The rocker boxes are back on, overhead has been run, jake heads installed and adjusted. I stopped just short of firing it up so I'll bleed the jakes and see if I performed the overhead correctly on another day. Side note: while the rocker boxes were off I...

@Lonnie was able to put his 25B jakes on without disturbing his rocker boxes but I was not that lucky. My crossheads crashed with the rocker box so they had to be removed. I got the rocker boxes and top of the heads cleaned up while waiting for the gaskets to arrive. Of course I installed the...

The napa 3M stuff was 08883 Underseal Rubberized Undercoating The better stuff might be the 03584 Professional Grade Rubberized Undercoating Currently I'm using 08882 Underseal Undercoating Paintable and it's working very well. The paint adheres to it nicely.

Bingo! Thanks for that number. The last digit make a big difference in searches...

Any ideas on the part number for the rocker box gasket?