ALLIS 175 VALVES

...and a D17 & up used long reach plugs.A WD45 plug will not reach the chamber...either way both heads should bolt on.They use the same rocker stands so if things don't fit you have to have wrong valves (too long).If that's the case who knows what springs are on it.PM your# & I'll send a phone picture of my head so you can see how things appear.

Edited by SteveM C/IL - 16 Dec 2016 at 9:20am

The head we have is 3 7/8" thick. The tractor ran before being torn down and the neighbor is second owner of the tractor, first owner says head was never off so how does the head we have, have  the wrong casting number on it if it was the same head he took in? Too darn cold now to do any work on it so it'll have to wait a while.

The D17 block uses 3 7/16's head studs instead of 3/8's. When mine was off this summer, the those 3 bores in the WD45 head would be large enough for a 7/16 stud. I don't think there was a change there. I think the only change was in the size of the manifold studs.

I believe the tall head is 4" and the short head is 3". You should be able to measure that pretty easily. The valve cover was also taller on the short head to make room for the taller rocker pedestal. I would bet that if you put a 1" block under the rocker pedestal, you can't put on the valve cover.

I see two glaring things that
Must be determined, did you receive
"Short" head from the machinist and are the valves the correct length. You have the casting number of you head I'm sure someone here can tell you if it is a short head. If it is then that's one problem since the short head needs long pedistoles. Although I thought the larger bolts on a d17 would make that impossible to bolt up. You need to determine if the valves/springs are correct. If you can see a difference in the valves from one to another I'd say that's an issue, remember valve clearance is measured in thousandths, you should need a mic. to tell the difference. I don't have a book in front of me but installed height should be easy to find and probably distance from tip to keeper grove as well as overall length.

Edited by Mrgoodwrench - 14 Dec 2016 at 10:15am

A D17 and tall WD45 head are the same. The only difference is the manifold bolts in a 17 head are 7/16 instead of 3/8's. There something else wrong.

If it's actually a D15 head, I don't think anything else would line up. I think they used a different manifold and probably other parts too. The D15 was a fair amount smaller motor cubeswise.

okay,but how is it that you don't have the correct stands for the engine?I never did get an answer on comparison measuring.What is really going on there?

Edited by SteveM C/IL - 13 Dec 2016 at 8:58pm

SteveM C/IL wrote: ...I just did some eyeballing with a tape measure on an E combine head(should be the same thing).Has no rocker shaft. 3 7/8 thick(not quite).Top of retainer approx 1 7/8 from spring seat.Top of valve stem approx 2in from spring seat. From rocker stand pad to top of retainer approx 1 1/8. How does that compare to what you have?

how does yours compare?

Yes, the head from E is same as D 17.    MACK

Just put the correct rocker shaft stands that go with the short head .

Are you serious ?

Well, the problem is now solved ! The rebuilder gave us the wrong head ! Part # AM4859 Should be AM4831. Hopefully he still has the one that belongs to us!

I got involved in this project after the push rods got bent and he was stumped for a reason why. Yes the piston does not come to the top of the liner I checked again. More checking I recon.