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Toro 624 power shift - new engine

29K views 100 replies 15 participants last post by  Kiss4aFrog 
#1 ·
Hi all. I have a 1988 toro 624 power shift here m#38510. Last year the governor broke and it raced itself to an early demise. I see the threads on using the hf 69730 6.5hp engine, which appears to be a good replacement for the Tecumseh H70 series engine. Mine has an H60 engine. Does anyone know if it is physically the same as the h70? Dr Google isn't clarifying it for me lol.

Thanks-
 
#2 ·
Hi all. I have a 1988 toro 624 power shift here m#38510. Last year the governor broke and it raced itself to an early demise. I see the threads on using the hf 69730 6.5hp engine, which appears to be a good replacement for the Tecumseh H70 series engine. Mine has an H60 engine. Does anyone know if it is physically the same as the h70? Dr Google isn't clarifying it for me lol.

Thanks-
Same mounting bolt hole pattern as the Tecumseh 7hp engine. Is your engine a 2 shaft engine or a single shaft?
 
#3 ·
Yea, H60 and H70 are same block. Most parts can be swapped between the 2 engines and I did take one broken H60 and one broken H70 and make 1 working engine.

As was stated, just make sure yours is a single shaft.
 
#4 ·
I just got done replacing the exact model powershift with a 6.5hp harbor frieght clone. I will tell you this - the mounting studs for the engine are the same as the H60 but the shaft is way too short. before really thinking through the swap I ground off the mounting studs and drilled new holes closer to the impeller. only one problem...on this machine there is no way to put the bolts in from under the machine because of the transmission and all the stuff that makes this machine powershift.
I finally got mine mounted by using L-bolts from the top and setting the engine over them carefully so as not to drop them below. overall massive pain in the butt to swap this machine with a clone engine. after I got the new engine mounted then came the issue of the belts lining up correctly so that the new pulleys, particularily the transmission pulley, didn't stayed engaged all the time. The alignment of the shaft from the clone engine to the H60 is different and the belt would stay engaged on the pulley no matter what size belt I used. the answer?? I had to make my own belt gaurds and try and gerry-rig this to take tension off the belts. yes, it worked finally, but I don't have much confidence in the final solution.

moral of this story - do a lot of research and buy a engine that has the correct shaft length and mounting holes otherwise you are in for a lot of work.
 
#8 ·
I'm not sure what POWERSHIFT93 used to repower his Toro but I would look into that model briggs - more money for sure but might be worth it versus the trouble. also have to figure the pulley will not fit on the Harbor clone as it is 3/4" shaft versus the Tecumseh 7/8".
 
#11 ·
I'd look into another engine if the price is reasonable. The predator engine at HF (which is 5 miles from my house) is the one i keep coming up with when I search. I'm not looking to drop $500 on a 26 year old machine I can replace for $1000
where are you located. the parts for those POWERSHIFTS are still made right here in the frozen tundra of MINNESOTA. trust me the new ones are not as good as those old POWERSHIFTS.
 
#23 · (Edited)
Pulley came off very easy. Output shaft is 7/8" with a key groove. Shaft is approx 2 7/8" long

I can go over to HF later and dbl chk shaft diamter on those engines. Searching tells me it is 3/4", so I am not sure how i'd compensate for 1/8". The HF 6.5hp motors appear to have a 2 7/16" output shaft. That is ~1/2" difference. I don't see why I couldn't move the engine forward in some manner, but I have to look closer.


edit 1: huh, adapters are out there
http://www.ebay.com/itm/like/111289564839?lpid=82

edit 2: predator manual says 3/4" shaft diameter
 
#24 · (Edited)
Briggs & Stratton Horizontal Snow Engine 8 TP 7/8" x 2-25/32" #12A103-0148

$282.43 shipped to my door. Not unreasonable. With a starter. I wonder how much different the mounting base is.

We don't get MN snow her in NJ. It typically gets used 4 times a year. Some years more, other years never. Thus I'm not looking to dump a lot of $$ into an old snowblower.


Edit: I hate this. same place, $235 shipped!
 
#49 ·
Briggs & Stratton Horizontal Snow Engine 8 TP 7/8" x 2-25/32" #12A103-0148

$282.43 shipped to my door. Not unreasonable. With a starter. I wonder how much different the mounting base is.

We don't get MN snow her in NJ. It typically gets used 4 times a year. Some years more, other years never. Thus I'm not looking to dump a lot of $$ into an old snowblower.


Edit: I hate this. same place, $235 shipped!
Briggs Stratton Horizontal Snow Engine 8 TP 7 8" x 2 25 32" 12A103 0148 | eBay

manuals, for those so inclined:
http://www.briggsandstratton.com/us/en/support/manuals/results?NTT=12a103-0148-E8
 
#25 ·
you are going to have to switch or move the mounting brackets under the transmission they are riveted in there so you will have to drill them out and replace with 1/4 by 1 inch bolts I would use stainless steel so they do not rot. when using the BRIGGS stud mount they will line up the pulley right on the mark. you will have to check to see if those belts are the same length. they might be the same or different between the two engines. let me know if you need anything..
 
#28 ·
Is the trans difficult to get out of the way? I don't see it being difficult to mount the engine. If the shaft is too low I'll shim the engine up with some steel. Else I find new belts. Can you use automotive v-belts on these?

Busy with yard work today, I'll try to pull the engine off tomorrow then I'll have a better look. I did throw some pb blaster on the 4 mounting nuts today.
 
#30 ·
no you can not use auto belts. the transmission will have to come out. do you have a TORO dealer near you????? it is better to swap belts then to shim an engine. snowblower belts are fractional hp. were auto belts are not. I can walk you through the removal of every thing.
 
#34 ·
#35 ·
Engine is off. Three nuts came off easy, one of the back studs snapped. No big deal.

At quick glance it looks like the trans comes out kind of easy as an assembly. I guess more research and looking at the manual again. Seems the auger impeller will need to come off too. Maybe a good time to add those flaps I read about. 99% of our snow is wet, dense snow.

Looks like there is some room between the mounting surface and trans cradle. That might offer some options too.

This can't be any harder than when I put a six speed trans in my second gen camaro. Nothing some ingenuity and my welder can't handle lol
 
#36 ·
Engine is off. Three nuts came off easy, one of the back studs snapped. No big deal.

At quick glance it looks like the trans comes out kind of easy as an assembly. I guess more research and looking at the manual again. Seems the auger impeller will need to come off too. Maybe a good time to add those flaps I read about. 99% of our snow is wet, dense snow.

Looks like there is some room between the mounting surface and trans cradle. That might offer some options too.

This can't be any harder than when I put a six speed trans in my second gen camaro. Nothing some ingenuity and my welder can't handle lol
you WILL NOT need a welder for this operation. there has to remain clearance between that for the adjustment of the trans. and the powershift feature.
 
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