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Late cub engine into an early cub

S

steve midcoast

New User
Putting a later cub low boy engine into my father in laws 48 cub..Noticed a difference where the hydraulic lines go into the front of the block...Coming off the block on the early engine there is an adapter that the two lines bolt into. The adapter is held on with 4 bolts roughly at positions 11 o clock, 1 o clock , and 5 and 7 o clock. The block is threaded in these 4 positions to accept these bolts. The newer cub engine has holes only at the 11 and 5 o clock positions.(this engine did not come with the adapter, so we need to mount the old adapter to the new block) Has anyone done this conversion and just used the 2 bolts to hold on what originally was held on with 4? Or do we need to drill and tap 2 additional holes to mount the adapter that the two lines bolt to? Any info appreciated.thanks.
 
The adapter is actually a pump. only 2 of the bolts go all the way through, the other 2 hold the halves of the pump together. If all 4 go into your original engine block, someone has drilled and tapped it, probably because the holes were stripped in the original pump. good place for a helicoil to repair pump. Depending on what the engine is from, make sure the crankshaft is drilled for a pilot bushing.

Looks at these pictures,
http://www.tm-tractor.com/ghy/pump_001.htm
 
John is right. The hyd pump should be a direct swap, provided that it is original IH equipment.
As for the engine, if it came off a numbered series lowboy you will have issues with the crank and pilot bushing. The numbered series lowboys do not have the same clutch setup as the older lowboys (pre '68 ).

Stop by the [b:c8da4b3c46]Cub Forum[/b:c8da4b3c46] for loads of Cub information.
Good Luck.
 
Thanks for the detailed responses and the pics. That explains the extra 2 bolts,as we have not dismantled that portion yet. Glad to hear that 2 of the bolts hold the halves together and are not threaded into the block. As far as the crank and pilot bushing, are you referring to where the input shaft of the transmission would go? Will check that this morning. This engine is yellow so thinking it came from a 154 cub low boy?....Will we have compatability issues that are not do-able or able to be modified so as to fit our 48 Cub? Thanks for the help, we appreciate it, Steve.
 
Update: Went down to the garage and the new engine just has a small recess in the center of the back of the crankshaft. There is no pilot bushing, so we expect we will have to drill out this area and install a bushing. Anyone out there have any expereience with doing this and/or suggestions? Thanks.
 
Steve,
I don't have any experience doing this, but it can be done. Should be able to take the engine and a new pilot bushing to a good machinist and let them handle it from there. After installation, the ID should be .626 to .627 . Take a look at the following.
[b:468a19168b]GSS-1008 Spec Manual[/b:468a19168b]
[b:468a19168b]New Pilot Bushing[/b:468a19168b]
Remember all the tune up specs will be for the later engine. It has a higher RPM than the older engine with a few more HP.
Let us know how it works out.
 
Thanks screwstick for the link and info on the bushing...As the crank on the newer engine has 2 recesses, one outer and one tapered cone shaped recess in the middle, we were hoping to mike the outer diameter of the input bushing and use that size for the drilling of the hole to accept the bushing.Noticed john *.?-!.* cub owner(thanks to you as well John) mentioned that one would not be able to center the hole accurately enough, so will think about the centered recess which basically gives the position to start the hole. Of course one surely would not want to get it cocked to one side or the other, so will think on the machine shop possibilities in our area as well.And yes, as far as tuneup...the new engine of course was a distributor setup(not included with engine)...so we will be re-installing the magneto and timing that.Not as smooth or as easy as a direct replacement, to be sure, but we are hoping to plow our way thru it ;-) If anybody out there has done the drilling of the pilot bushing hole without the aid of a machine shop, we would appreciate hearing about it. Thanks.
 
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