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  #1  
Old 07-31-2010, 10:35 PM
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jeffscub jeffscub is offline
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Default motor transplanting questions again???
Guys,

I got the splined spindle off of the 12 today and successfully installed the "pulley looking thing" that the 3 pronged plate goes to in its place. On the engine block itself there are holes where the other mounting system was bolted to, from front to back, the measurement is 4 1/4". On the oil pan, there are threaded holes that measure real close to 5", front to back. I'm not sure what the measurement is side to side. I was already clean when i was taking these pics. Now on my mower the mounting holes are real close to 5" also, front to back and roughly 7 5/8 side to side. Say for instance that this motor will mount up perfectly. What is the measurement from the motor mount to the drive shaft? And if these pics don't help, then tell me where else I need to shoot.
Thanks guys!!!!!!!!!!!!

Jeff
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Jeff
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  #2  
Old 07-31-2010, 10:48 PM
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cubs-n-bxrs cubs-n-bxrs is offline
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Jeff in the top right pic is the 2 holes under the points wire part of the block or is part of the bolt on oil pan?
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  #3  
Old 07-31-2010, 11:27 PM
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Originally Posted by cubs-n-bxrs View Post
Jeff in the top right pic is the 2 holes under the points wire part of the block or is part of the bolt on oil pan?
that is on the block itself. there were some funky shaped braces ( you can see them in the other pics on the thread "he shoots, he scores) that were mounted there. BUT i think the oil pan MAY line up on the 108 engine mounts. in the lower left photo, you can see the bottom of the oil pan and those holes are threaded but i need to know a height measurement from the motor mount to the drive shaft "centerline". cause if this oil pan is to high then i will need the one you got, but if it lines up right, then i can use the one on it now. i may get out there tomorrow and mess around with it. it's only going to be 101 here tomorrow, temp not heat index!! so if i can get an accurate dimension from somebody, then i will know which one i need. jeff
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'72 108 w/ 38" HIGH speed deck, '77 1200QL w/ homemade grader blade, '79 1450 44" grass tamer, '70 sears super 12 w/ 3pt , 19?? 100 w/ extra toys, 69' economy powerking 14 horse w/ FEL, 65' economy powerking w/ toys, 1982 allis chalmers 716


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Old 07-31-2010, 11:39 PM
Yosemite Sam Yosemite Sam is offline
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Hard to tell from here, it looks like that engine may bolt up.

You will most likely NOT use the holes in those funky "wings" on the sides of that pan, instead you will need to use the holes in the bottom of the pan.

However I don't/can't/won't guarantee that they will line up with the holes in your frame, and I'm pretty sure you don't want to drill new holes (in the frame or anywhere else) to mount the engine.

You're going to have to measure the holes in the bottom of the pan and then measure the holes in the frame to see if they are close.

Your concerns about the location of the holes in the pan in relationship to the front/back of the engine are justified, if they are farther forward or further to the rear then the drive shaft won't hook up and your pto may not work

One other thing you have to keep in mind is that the centerline of the crank shaft (horizontally) MUST be the same as the old engine, or the pan must be changed. In other words; if the pan on the new engine is thicker or thinner than the correct pan then the crank shaft will not line up with the drive shaft and that will cause problems.

My best advice; Measure the holes in the bottom of the pan, measure the holes in the frame, if they look close, set the engine in the frame and see if they line up. Then measure to see if horizontal centerline of the crank is the same as your old 7hp. If any of the measurements are different, then hunt up the correct pan.

All of that should be about as clear as mud for you.

Good luck.
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Old 07-31-2010, 11:43 PM
Yosemite Sam Yosemite Sam is offline
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so if i can get an accurate dimension from somebody, then i will know which one i need. jeff
Set your old 7 HP engine on something flat and measure the height of the centerline to get your measurement.
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Old 07-31-2010, 11:55 PM
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Set your old 7 HP engine on something flat and measure the height of the centerline to get your measurement.
it's funny how i can do machine shop work (28 years), operate automatic and manual metal spinning lathes (10 years), know motorcycles top to bottom (39 1/2 years), but the most basic thing "set your motor on a flat surface and measure from it to the center of the shaft" just escapes my mind, if did drugs, i could blame them, but i DON'T!!!!!! so i am going to blame it on aliens!! plain and simple, the aliens! good night all. jeff
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'72 108 w/ 38" HIGH speed deck, '77 1200QL w/ homemade grader blade, '79 1450 44" grass tamer, '70 sears super 12 w/ 3pt , 19?? 100 w/ extra toys, 69' economy powerking 14 horse w/ FEL, 65' economy powerking w/ toys, 1982 allis chalmers 716


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