Posted by the tractor vet on October 16, 2007 at 21:59:20 from (75.19.122.110):
In Reply to: 856 engine -407 posted by stumped Decorah ,Ia. on October 16, 2007 at 20:30:10:
Yep KB almost hit the nail on the head . If one does not know these engines then all he is building is a handgernade . Ya have to remember that that engine is OLD . And when i do one of them ya have to do EVERYTHING . Line bore the mains then wright off the bat ya bore the block to .010 over and do the bore off the center line of the crank. Next ya just dust the deck and i do mean dust the deck with a rotary brouch , then ya recut the contour bores and make sure that the sleeves are set dead on as with this engine there is NO repulling sleeves and re shimming them . Then after ya PRESS FIT each sleeve ya check each and every hole with a dial bore gauge from top to bottom all the way around as the sleeves will wrinkle while being pressed in and to correct this ya have to run a rigid hone thru each and everyone. Then ya fit each piston to the hole that it is going into . Then ya put the rest of the engine together . When ya build any 361-407 ya do it like you are putting together a race motor . This is not and engine for the DIY guy or just any Tom Dick or Harry machine shop to build . After she is back in the tractor ya just don't go out and put it on the plow or chisel or the chopper or a disc. , not for the first 30 hours even then ya hold your breath . I liked doing a run in on the dyno for atleast 8 hours at the shop at varying loads and rpm's . Then at 50 hours have the tractor brought back in and retorque the head and reset the valves . You are not the first guy that this has happend to . I had a guy come in and wanted me to rebuild his 806 and when i gave him the price he did not like mine so he just knew that he could do it for less. Well after five blocks and five trys all ending the same with a blowen engine before he had fifty hours on each of them he gave up and brought me a well used up D361 and said go for it 3250 bucks later he was up and running and that was 15 years ago and it is still going like the Pink Bunny.
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