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#1
04-25-2015, 01:42 AM
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ACR Issues?
Got a freshly rebuilt K301 that is very hard to start. It will crank and crank and never really try to start. I swapped carbs with a carb off a good runner, no change. I static timed the points, no improvement. I have good spark. Rechecked the valve lash, within spec. In order to get it to start I had to tighten up the point gap a little from the static time gap, which came out to about 0.021/0.022. With a tighter gap and a little throttle it will finally start cranking faster and eventually take off. Prior to this it would occasionly backfire and cranking speed would fluctuate. I pulled the head and gasket looked good and valve seats/sealing looks good. I have not pulled the cam cover yet. The springs and weights looked good when I put together the engine, but the can was from a different motor as I chose to not use the original can as there was some wear on the points plunged lobe. With head off the exhaust valve does lift slightly on the compression stroke. Attached are some pics.
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--- 5x Originals, one with rear PTO, 70, 2x 100's, one w/ creeper,2x 102's, 2x 122 w/creeper and rear pto, 2x 123's, 105, 125 w/ aux hyd,2x 73's, 126, 2x 147, 86, 2x 108's, 129, 2x 149's, 169, 3x 800's, 2x 1100's, 1250, 3x 1650's, 682, 2x 782's, 782D, 982 w/60" Haban, 1872 w/ Haban deck 2 Rear Tillers, 1 Snowblower, #1 cart and 2x #2 cart IH/Cub Cadet 79C Chipper 526 Front Tine Tiller Brinly plow, disk, grader blade 
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#3
04-25-2015, 08:18 AM
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as long as you have the head off just take a little time to follow the ACR instructions in the manual. and while you are at it roll the piston to TDC compression then roll it another 360 degrees. this is split overlap. at TDC both valves should be open about the same amount. if ones higher or lower than the other the cam timing is off
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#4
05-14-2015, 02:46 PM
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Just wanted to follow up on this so others can see what happened, I checked my exhaust valve lift following the ACR adjustment instructions in the manual and found that my exhaust valve was lifting about 0.058", specs are 0.031-0.042". I adjusted it down to 0.031" and put the head back on and it started right up, made a few little timing/carb adjustments and it runs great now. This is the first time I have ever had to mess with the ACR, but will start checking the lift anytime I have a motor apart for repair.
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--- 5x Originals, one with rear PTO, 70, 2x 100's, one w/ creeper,2x 102's, 2x 122 w/creeper and rear pto, 2x 123's, 105, 125 w/ aux hyd,2x 73's, 126, 2x 147, 86, 2x 108's, 129, 2x 149's, 169, 3x 800's, 2x 1100's, 1250, 3x 1650's, 682, 2x 782's, 782D, 982 w/60" Haban, 1872 w/ Haban deck 2 Rear Tillers, 1 Snowblower, #1 cart and 2x #2 cart IH/Cub Cadet 79C Chipper 526 Front Tine Tiller Brinly plow, disk, grader blade
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