how to time a 8 hp briggs engine

**hotroddal** · 06-10-2006, 09:46 PM

how do I time a 8hp briggs engine, thats all i need to know?
thanks hotroddal

**MTS** · 06-10-2006, 09:58 PM

You talking cam/valve timing? Theere should be a little mark on the cam-shaft gear and the crank you have to line up when the piston is at TDC.......with the flathead brigs anyways.

**hotroddal** · 06-24-2006, 11:06 PM

is there any way to tell if your engine jumped time or is that possible for it to jump time.

**85ytz250n** · 06-25-2006, 12:02 AM

It would have to have the teeth on both the crank and the cam worn to almost nothing. The timing marks have to be lined up, the timing mark on the crank will be tdc and the timing mark on the cam will be bdc, now all that means is the marks will be like this : I have never seen a 5hp jump time, havent worked on but a couple 8hp so I cant tell you 100%. I hope this helps.

Barry

**hambone** · 06-25-2006, 07:42 PM

i've never seen a briggs jump time.
has it thrown a rod before?
you may have a stuck valve , briggs is notorious for valve sticking.

**hotroddal** · 06-25-2006, 09:24 PM

it has never thrown a rod before, im not sure if it has a stuck valve , is there a way to check if the valve is stuck?

**85ytz250n** · 06-25-2006, 10:31 PM

You can pull the head off, and turn it over by hand. Unless it has the OHV and then you would have to ask someone else, I am more knowleadgable about the older briggs. Pulling the head is no big deal, just remember which bolts come from which hole cause there are different lenghts. What are the problems you are running into with this engine that makes you think it jumped time?

Barry

**corndawg** · 06-26-2006, 12:19 AM

make sure the key on your flywheel isnt sheared or partially sheared, that will make the magenents on the fly wheel pass over the armetuer at a different time, therefore jumping time

**hotroddal** · 07-03-2006, 11:17 AM

what problems I am having is that the engine wont start it has great spark, and is backfiring and spitting gas out the air intake on the carb, so i thought it may be the timing that is off.

**hambone** · 07-03-2006, 02:03 PM

flywheel key is broke and the ignition timing is 180 degrees out.
pull the flywheel and put an new key in and make sure the flywheel nut or starter clutch is real tight or it will just shear the new one.

**hotroddal** · 07-03-2006, 04:23 PM

thanks for the help, i will go and pull the flywheel and see if the key is sheered.

**MTS** · 07-03-2006, 11:56 PM

Sounds liek a stuck intake valve to me....i have NEVER seen a brigs Shear a Flywheel key, im sorry but unless your running on alky, it dont happen....lol

**200m** · 07-04-2006, 02:17 PM

hi. it could be the flywheel key and they do shear if a heavy load is put on right away it causes the flywheel to keep going so it shears. and yes all engines can shear the flywheel key. if its backfiring and spitting gas its the key. ive had that problem before and i put a new key in and it started right up

**hotroddal** · 07-04-2006, 02:50 PM

well I took that mesh screen off the flywheel and that aluminum piece that it screws to off the flywheel, and it doesnt look like the flywheel key is sheered, is it possible to tell if it is sheered just by looking at it or will I have to pull the flywheel?

**hambone** · 07-04-2006, 02:57 PM

they are bad for imprinting a small score on them.
i'd pull the flywheel to check it out.
i've had many do this.
if it pops and spits bad after starting you'll have to do a valve job.
most likely a burnty valve then.
hope you find the problem

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how to time a 8 hp briggs engine