Question about Briggs AND Stratton Intek 21M314-3017-F1 342cc Professional Series Snow Engine with 3/4 in. Tapped 3/8-24 Keyway Crankshaft CARB

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Compression release is not working, valves have been adjusted.

What else will cause compression release problems besides valve adjustments?

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Worn cam lobes.

Posted on Feb 05, 2017


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My Husqvarna ride on LTH1797 always had a start problem sometimes starts if I wind the fly wheel compression, 3 new batteries haven't helped.

I would start with adjusting the exhaust valve . When the gap is to large the compression release can not work properly and will sound and feel like a low battery. When the valves are adjusted correctly the compression release will hold the exhaust valve open a little and allow the starter to spin it over with less resistance and once started the rpms will increase and centrifugal force will retract the lobe and compression will be full on. I am attaching a photo of what this part looks like on the camshaft not that you should need to go in there but just to satisfy your curiosity.

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Honda 13 hp won't start...back fire's

Assuming that the engine has not been taken apart and timing is set correctly. Have seen this often. Usually valve adjustment. Adjust valves as per manual so that compression release is working. If compression release is not working after adjustment check for faulty cam.

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Have a craftsman 17.5 ohv LT1000 lawnmower. The valves have been adjusted a number of times but they get out of sync and the back pressure keeps the engine from turning over. What else can be done to...

You could back off the flywheel on the engine by hand by rotating it OFF of the compression stroke prior to turning it over with the starter. That is the way I did it before I adjusted the valves. If the valves are adjusted correctly, the compression release feature will operate (if not faulty) correctly and a fully charged battery should turn the engine over without problems. I don't understand what you mean by "out of sync." Here is how Briggs states to adjust the valves...this way or no way. See the Adjusting Overhead Valves section.

Jun 06, 2011 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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The starter won't completely turn over even though

Sometimes on the Briggs and Kohler engines, the compression release fails to operate at the proper time or is malfunctioning. A remedy for this is to remove the valve cover(s) and adjust the OH valves per the manufacturers specifications. This enables much easier starting, produces less wear and tear on the starter and may allow your new battery to completely turn that engine over. Out of adjustment valves mimic a weak or failing battery quite well and the engine hangs up on the compression stroke because the compression release system is not working properly. Adjust those darn valves.

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Having problems with B&S 18.5 HP Intek. Turns 1-2

This sounds like a compression release issue, which is directly related to the OH valves needing adjustment. Remove the valve cover and adjust the valves per B & S exact instructions and your starting issue will likely be solved. The valves are needed to be adjusted periodically on these machines. The compression release feature works off of the camshaft and is controlled by the action to the intake valve. It works at low speeds and then cancels as the engine starts running.
Many, many users have this problem and are unaware of the compression release mechanism and the fact that the valves periodically require adjusting, They tend to blame their starting problems on a weak or bad battery, which this problem mimics quite well.

May 08, 2011 | Craftsman Garden

1 Answer

24 HP B&S ENGINE HAS compression lock up when at first turn over. I have to turn the flywheel by hand past compression . DO i have a decompession valve problem and how do I repair this ?

Usually a valve adjustment will remedy this problem. The compression release is built into the valve train. If the gap is too great, the compression release will not function properly and you will be trying to start the engine under full compression and the starter motor will not do that. Without knowing the model no. of the engine it is difficult to determine what the valve adjustment is for your application. You would be safe to set both at .004? You may want to contact a local dealer or Briggs website once you get the engine model no. to get the exact specs. I will say that in worse case scenarios, the compression link brakes on the camshaft and no matter how you adjust it, it's not going to help, but again that is rare. That problem of course involves replacing the camshaft. Hope this helps in some way.

Mar 07, 2011 | Craftsman 24 Hp 48" Deck Yard Tractor

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Engine turns over with spark plug out but as soon as put plug in it turns over till piston comes up on compression stroke I am thinking time for new starter ?

It's possible that just the valves need to be adjusted. Instructions are on the Briggs site. These OHV Intek engines have a built in compression release that causes the problem you are having when the valve lash is out of adjustment. It's a relatively easy fix and you only have to remove the valve cover (4 Bolts) to access the rocker arms to adjust. For your info the web location is:
Go to paragraph "Adjusting Overhead Valves."

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I have a craftsman lt 1000 w/brigs&straton 17 horse engine i replaced battery & starter but the engine turns over slowly but wont start the battery is fully chaged Im a good mechanic but this has...

It sounds like the compression release is not working,it works by opening the exhaust valve during engine cranking.For the compression release to work the valves have to be adjusted,especially after the engine is broken in.Set the engine to top dead center on the compression stroke,the exhaust valve should be set to .004 and the intake to .002. I think you will find the exhaust valve is way too wide which is causing the hard crank problem.Set the valves by adjusting the nuts on the rocker arms,it should be a torx set screw located in the rocker arm.First back the torx screw out about a turn then hand tighten the rocker stud with the feeler gage in place then tighten the torx screw down to lock the setting.

Aug 05, 2009 | Craftsman Garden

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