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Thanks Guys! Richard, I appreciate your detailed description on removing the timing button. I also recall reading joesco's description in his HUGE thread in which he called the little circular wire clip a "Jesus" clip. I got a chuckle out of that! I looked at Fig. 7.4 in TM-34 and...

Thanks for your excellent post, Richard. What you wrote is very clear and perfectly logical. Since I don't have Jerry's IP, I could ask him if he knows what its button number and port closing dimension were, but I agree the only way I will ever ultimately know for sure whether my IP is timed...

Thanks Richard, I was aware that it uses an Onan DJF engine before I purchased it. I was not aware Onan began producing them about 1970. I think (based on the initial dates in the TMs) the DOD started purchasing them around 1977. Unfortunately, the civilian models that wait quietly seldom...

Hi again everyone, As I noted earlier, I’ve been thinking about the issue of what must be done to retime the IP in my particular situation. I re-read the relevant section in the TM-34 several times, and also reviewed many past posts herein on IP timing. There appear to be two potential issues...

Hi Everyone, Happy New Year! Thanks for your responses and encouragement. It’s high time I updated this thread to report my progress to date. As you can well imagine, I also have a few questions. The Wednesday before New Years day, my daughter and I drove the 300+ miles down to...

Richard, Thanks for your post. I don't know where else the nut could have come from either but I'm not yet as familiar with these units as many here are. However, I'm certainly getting a crash course! I can't possibly imagine anyone purposefully and maliciously destroying such a fine...

Here is an update. I finally got the gear cover off yesterday afternoon, and I found significant mayhem inside. I will post some images when I get a chance. I still don't know the exact sequence of events that caused this catastrophe, but it involved a hardened steel 7/16" nut that somehow...

Thanks, Jerry. Sounds like the delivery valve spacer is not critical. I wonder why AMBAC designed the delivery valve this way. Maybe it's a buffer, kind of like the recoil buffer in some firearms. You have a PM regarding the short block. Stan

Thanks, Keith. I did not know all diesels are interference, but it makes sense given their high compression ratios compared to gas engines. I did know some gas engines are interference, like Subaru boxer engines. From what I can currently observe (admittedly very little) upper valve train...

Thanks, Richard. I'm going to tear it down, determine what happened and what else it may have damaged, then go from there. If the cam is broken, it must be up front near the gear since none of the valve train moves. Stan

Hi gents, Well, at this point in my examination of this no-start situation, I'm sure that I have a much bigger problem than a non-functional IP, but at least I now know why the IP is not functioning: The camshaft is not turning! I took off the front rocker arm cover in order to be able to...

Thanks, guys. I really appreciate the attention I'm getting here. If the weather cooperates (003a and its trailer set in the driveway to my workshop due to insufficient room inside), the IP is coming off today. I'll let you know what I discover once I get it apart. As Keith mentioned, I...

Thanks, Keith. From my local yellow pages, I found a place in Bangor PA not too far from me called Diesel Systems Inc. "specializing in the rebuilding of all makes of fuel injection pumps & fuel injectors". Perhaps they can get parts. Does AMBAC sell directly to the public? If Diesel...

Thanks, Keith. The mirror and flashlight idea sounds like another trick learned from experience. There is a White/Volvo repair shop near me, but I don't know whether they work on injection pumps. Perhaps they can either source any needed parts or suggest who can. I think Cummins bought...

Thanks, Keith. I really appreciate your advice and frequent feedback. I printed a copy of the AMBAC manual. Another member sent it by PM to me earlier before I realized it is available in the Wiki. I would appreciate confirmation that I understand the timing procedure before I pull the...

As I described above, I inserted the 3/32" drill in the delivery valve orfice and used a ratchet wrench to crank the engine through two revolutions, while using digital calipers to measure the distance between the exposed end of the drill and the lip of the threaded hole in the hydraulic head...

Thanks, Keith. After lubing the pump with clean fuel, the first order of business today will be to insert the 3/32" drill in the orfice under the delivery valve, measure the distance from the top of the threaded hole for the delivery valve holder to the end protruding end of the drill and see...

I'll get some Chemtool, but I tried the solvent I had, some choke, throttle body and carburetor cleaner (contains methanol, acetone, toluene, not necessarily in the order of their concentrations). I sprayed the orfice containing the plunger using the small plastic tube attached to the spray can...

Thanks, Keith. So, based on your response and going by the terminology in the TM-34, piston=plunger and control collar=plunger sleeve. Is this correct? So if the plunger was stuck in an open or partially open position against the pressure of the plunger spring, then the pump tappet would no...

Thanks, Keith. I think the FAQ you are referring to may be in the Wiki, where in Part 6.2 under the IP, the following is stated: "O.D. Fever posted this help for a Stuck Injector Pump Plunger also: "Before you remove the pump try to unstick it. I have done this with success twice. Remove the...