Kohler K-series ACR, Automatic Compression Release Overview
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- čas přidán 2. 01. 2021
- Here we look at the camshaft out of a K series Kohler engine and explain how the ACR works. Symptoms of a broken or missing ACR spring and and how it might be fixed.
I've been fighting with starting issues with this kohler of mine, I think this is my problem! You described it to a TEE! I have gone thru all the wiring, solenoid, Cables, Grounds ect, ect! I'm heading out to take off the cam cover! Thank you very much for taking the time to post this!
Helpful? Man, I could hug ya' ! Thanks for the demo - my spring came off, too, and I just reached in and hooked it back up. I'd never have known why the thing wouldn't turn over without this video. Cheers from South Carolina!
Glad it helped!
Great video! My actuator tab appeared worn at first glance, but closer inspection showed the leading edge had been ground down. Replaced camshaft.
Had to see what wire you temp remove to do a compression test on old Kohlers.
I see it perfectly now thanks to your vid & great job explaining its operation. Thank you!
Either you'll need to reverse pull start a Kohler engine or pop your cam/points cover off & remove this fine wire temporally to test your compression on K/Magnums. You can wrap the rope around the PTO and give it a pull backwards a few times.
Peace all!
That exhaust tab on the cam is adjustable by bending it slightly with a screw driver. Lift it slightly to release compression. When engine starts the weights fly out allowing full compression.
Thanks so much!!! I had to replace my connecting rod and compression rings and afterwards the poor old girl would hardly turn over. I thought it was a weak battery but even with a fully charged battery it usually stuck on rolling over, I now know at the compression stroke. I took the cam cover off and a wee piece of metal was jammed in the ACR, I suspect from the broken connecting rod. I fished it out with a piece of wire and Bob's your Uncle, its back to easy starting. Again...Thx so much for posting this.
Thank you sir. Great explanation of the system.
Excellent video. My spring end was resting on camshaft. Thanks
Great to hear!
Thank you for this post!
Really well explained. I didn't realize my K141T had this so was mystified by this short valve "bounce" as I looked at the valve while turning the engine over. Initially I thought it could explain a frequent backfire through the exhaust - that must have a different cause unless the ACR can stick ? All seems free enough so I doubt it. But thanks for this!
I just did the same thing. Saw that valve crack open and had no clue why. half a day later and a yard full of parts...... now I know. oy-vey. my spring was gone!! found half of it in the sump.
Thank you sir
I'm really hoping the spring is still there on mine and just off that tab
I have a older k241 in my cub 100 the cam is in 2 pieces. Can you tell me how to install it back into the block.? Do I need another pin to put the cam together? Then tap it out with the cam pin for the block.. just guessing.. love the dozer build..
Link to the service manual.
www.onlycubcadets.net/forum/showthread.php?t=4646
My cub cadet with the courage 19 engine will barely crank now and not start. When it does crank you can clearly see compression blowing back up through the throat of the carburetor. I very strongly suspect that poorly engineered and extremely weak A.C.R system is the culprit. Thanks for really good vid!
If it's blowing back through the carb, it's probably not ACR--ACR barely opens the exhaust valve. Might be valves need adjusting as it would be intake valve open to blow back through the carb. As for no crank, check battery, battery connections, ground connections (at battery and at engine). These are the most common causes of no crank.
Hey I’m having the same issue of the smoke blowing out with pressure from the carb and trouble cranking it over! Did you figure out what it was?
Sorry, the Courage is a totally different engine design.
This compression release setup is not poorly designed fyi. None of mine ever failed, I own 5 Kohler K/Magnum series engines. Own a 1976, (2) 1987, 1988 & a 1982 tractor. All but one have very high abusive hours.
Hope your up & goin, since Kohler stop making iron K/Magnums they no longer made industrial quality engines again
I had the rod fail in a Kohler once (3000+ hrs), never lost this little wire nor had a compression release issue.
Most likely your Courage is built in China. The same corp who builds Harbor Freight engines build todays Kohlers. If your engine sticker dont say China, most of its parts are made there.
The old K/Magnums mentioned in this video are USA built engines designed decades ago. Today Kohler simply outsources China engines & slaps a Kohler sticker on them, they ain't built squat in yrs. Unless somethings changed recently that is.
Does the ACR on the CH series work the same way? And if I understand correctly, the ACR wouldn't be a culprit for no compression situation since they fail in a way that keeps the compression?
Not familiar enough with the CH to comment on that, but, yes, failure results in no compression release, and hard starting.
@@woodandmetalshoptime8048 Thanks. Turns out the valves just needed to be adjusted. Zero lash was holding the valves open.
do you know where one could obtain a new spring?
Try ccspecialties.org
Mine works half the time any idea what’s up
May be sticky with sludge, keeping it from operating consistently? Or the spring is weak?
Great engineering. They put the pissiest, most thinnest piece of wire there and hope it will last 2000hrs. Bloody hopeless these designers so called engineers. They think they know everything.
Which it will last nearly 2000 hours. These were (and still are) some of the best Kohler engines ever made.