Buda 516 Parts Availability

Ian, thanks for the info. I did not realize the originals were flat top. I see in the Mahle catalog that they list the shallow cup pistons for the HD516. I found a parts manual on Minnpar and it looks like the bottom end connecting rod bearings are the same from 11000 back to the HD516, but the top bearing and piston pin PNs are different. I suspect they may be different diameters. Mahle does not mention having to change connecting rods out if replacing pistons so I'm not sure how accurate their catalog is for the HD516. I'm wondering if you convert to newer connecting rods (Reliance shows as available for 11000?) if you can then use the shallow cup pistons and newer piston pins. I suppose I'd need to verify compression height and volume.

Stumbling across that Minnpar manual scan was pretty helpful. Looks like head gaskets are at least common between the two engines. The middle crank bearings as you mentioned Ian are unique to the HD516 and I assume NLA. Wonder what it would take to modify the block to use thrust washers. Looks like the newer cylinder sleeves may work in old. Valves and guides are totally different part numbers and likely NLA for old.

Lots to ponder here. I am debating trying to take on a project with one of these engines that is probably in need of a rebuild. Lack of parts is definitely factoring in.

  Forty Five 45

Rod Bearing 4335403 4335403

Head gasket 4347798 4336430

(Front)

Piston    434743 4336512

Sleeve    4348072 4348072

 

There was a change in crank thrust arrangement at Lanova Engine #45-1670 to separate crank thrust washers.  These have a retaining pin.  I have no idea about when this would have happened but would guess it was similar for HD 11.  No idea on what might be needed to change - if lucky only the pin, if luckier it will all be there.  I can't give you a guess at year as graders assembled in Australia have different serial numbers to North America and we tripped over a short block so I haven't seen what is in it.

The graders with Lanova engine have a belt driven supercharger and the front housings, front cam bearing and camshaft are different from HD 11.

Lanova injection aims the fuel stream from the horizontal injector at the "air cell" on the opposite side of the cylinder across the flat top of the piston.  I'd be doubtful is that aim would be helped by having the dish in the piston intended for direct injection causing swirling on the way.

IIRC the thread for the cover nut on the injectors is 22 x 1.5 mm, which cuts neatly into a piece of 3/4" water pipe to make a slide hammer connection.  And you and an angle grinder with a thin cut-off can make an official special tool for the injector pipe nuts on the pump out of a long impact socket which makes that easier.

And I'd suggest checking the heads for cracks first.  We got our short block from  the closing down of a long time Allis dealer who built it but never got a good pair of heads to finish it as a long motor.  We got 2 good ones out of 5.

And the injection pump as it is an American Bosch  "PSB" with parts made of "unobtanium".  And the warning is that if it has sat unused to check THAT THE PUMP IS FREE BEFORE TURNING THE ENGINE.  Otherwise some of the internal parts like the plunger in the head can get broken.  

Anyone know if the newer 11000 series rods measure any longer than the HD516 rods, or if the piston compression height is taller on the 11000 series pistons? That's the only way I could see it making that up - although there may not be enough difference in those items to account for that loss of compressed volume from that dish.

                         

FWIW