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Well the new IP came in last week and got the hydraulic head installed over the weekend. With both the hydraulic heads pulled out, I went ahead and compared the two. The old one definitely felt "wore out." The plunger easily moved up and down and the red toothed gear spun very easily. The...

Svd dragunov, no it wasn't. I took a look at the site you sent to me, but kinda got a bad feeling about tht one. I bought mine from a very reputable MV parts dealer, got 2 complete IP's for about the price of one Chinese HH. Thanks very much for the link tho!

After some reading, I found the difference between the three model numbers. The HD90101a is the HH for an LDS motor, the HD90100a is the HH for the B,C,D,E code pumps. The HD90100aR is the same as the HD90100a, but as best I can tell the R stands for rebuilt. I saw the number for the G code pump...

So now a question on hydraulic heads. While searching for a replacement I'm coming across a few different part numbers, HD90101a, HD90100a and HD90100ar. All look the same as far as i can tell, and say they are for M35 trucks..What is the difference between them? Which is the one I need for an...

I thought about I being 180 out, but I think it's a real long shot... The first time I pulled it I got the red tooth pointed towards the alignment mark and did not turn motor at all. So by my reasoning the position that I installed the first time would be the same position that it was able to be...

Ok, after sitting and thinking about why/what is going on with the truck, and reading I don't know how many hydraulic head threads and TMs, I'm thinking that the bad batch of fuel toasted the HH. It wasn't bad to begin with, but over the course of 3 months and lots of WMO, it wont idle hardly at...

Meaning after the dirty batch of fuel on our trip..... (Yes fsearls92 is my brother :-) )

Ok, here's what I found.... Aligned the timing marks on the injector pump and verified them with the ones on the harmonic balancer. With those two lined up, the red tooth was one tooth to the left of the alignment mark. So I turned the motor until the HH came free (easily) and lined the red...

When I put the HH back in I didn't check that the red tooth was aligned with the pointer. I just assumed that if it would only come out on way, then it would only go back in one way... Guess I will pull the IP timing cover and verify that everything is lined up as it should be this afternoon and...

It came out very easy! Got the red tooth lined up and out she came, no problem there. The only reason it was hard to get it back in was that when I was sliding the new orings in the HH, I accidentally spun the gear with the red tooth while the HH was out. I didn't know which way I had turned it...

Nope no water, it was out of my weedeater.

Anyone???

Another thing I forgot to add is that it's now running on 90% diesel and 10% WMO with a touch of 2-stroke gas.

Ok here is some back story to the current problem, don't know if it is relevant but can't hurt! It's on my 1965 M35a2c LDT 465-1c D turbo Stuff started acting up when my brother and I got back from a 600 mile trip in 0 degree weather running WMO and a heavy load. The truck had a hard time...