valve adjustement

[ILENGINE]

Looks like a Briggs 500E. Even with compression release, 30 psi of compression is too low to start and run.

Have worked on a generator that has 5% bypass when tested with a leakdown gauge, but compression gauge showed 5 psi. Have come across several out of the box Briggs push mower engines that had 30 psi before even being ran for the first time and that was the old L head engines.. So compression can be misleading in some cases.

 

[slomo]

pulled flywheel replaced key, compression 30 psi , has spark on coil tester, but still will not start

Did you test for compression with a car type gauge? Something like this?

 

[slomo]

You need one like this.

 

[hlw49]

Pull the valve cover off and make sure the valves are working properly. Have seen timing gears get broken when something is hit really hard.

 

[glyn1718]

As hwl49b says, take off the timing cover and check the valves are operating (opening and closing). If confirmed, you need to check the valve opening in relation to piston location. E.g both valves closed at piston TDC. I suspect that the cam shaft gear may have slipped. The gear is a "push fit, onto the camshaft and a sudden stop can cause it to shift (rotate) from it's correct alignment. If so it's a replacement camshaft I'm afraid. Look up on YouTube "Tayrl fixes all" camshaft replacement

 

[sgkent]

cam timing could also have changed if the engine has a plastic gear or plastic lobe type camshaft. Enough force to bend a blade is a pretty sudden stop. Unless it is a really high end lawn mower, it might be time to either re-engine it, or look for a used one of similar model that does run.

 

[bentrim]

Are you trying to start the engine with the blade off? If so it will be very, very hard to do so. The engine has an aluminum flywheel which is not heavy enough. The engine depends on the blade to act as a flywheel.

 

[rhkraft]

have the following engine b/s 09p602-0143-f1 the engine will not start blade was bent, checked key on flywheel looks to be good, valve clearance is greater than specs. looking to find a procedure to adjust the valves, hopefully after adjusting valves the engine will start

thanks

AC

 

[rhkraft]

If the engine stopped due to a blade strike that bent the blade, you could have a bent crankshaft. Have someone turn the engine slowly and look for a wobble in the crankshaft where the blades were.

 

[Chipg1956]

To actually answer your question the easiest way is to turn the engine over until one valve is fully open, adjust the closed one. I had a customer that adjusted valves that did not have a good handle on decimal places. He adjusted his valves to .050 instead of .005. Don't be that guy. Now as far as your no start problem goes, be certain that you didn't mess up the little contact that turns the motor off when you release the bail handle. You may want to check for spark with the wire removed off the coil.