Re: ENGINE WILL NOT START CONTINUED

[wmmulvey]

THANKS FOR ALL YOUR HELP


Engine running great last 4 yrs. plus.

Replaced rotor, points, condensor, wires, and plugs as routine spring maint.

Did not touch timing.

Last run of A-4 was on 6/9/11 for an hour or so.

Week later was the start of the NO START problem.


At that time I did all the ignition checks and replaced dist. cap and coil.

Compression good on all fours.

TDC on the compression cycle. Rotor facing 9 o'clock. Rotor on the dist. (left it off once a long time ago

) LOL

#1 SP wire from flywheel end at 9 o'clock
#2 at 12 o'lock
#4 at 3 o'clock
#3 at 6 o'clock

Gas good

Carb float bowl OK.

I do not think the carb jet is fouled but will check this out in the next round.

Next step maybe valve timing.

I went on Moyer Marine and I did not see any parts labeled VALVE TIMING GEAR.

In the service manual under the troubleshooting section under ENGINE WILL NOT START (POOR COMPRESSION AND OTHER CAUSES) it suggests valve problems amoung other things.

Has anyone done a valve timing? How difficult is that?

Does the The Moyer Marine Service and Overhaul Manual show the complete breakdown and rebuild of the A-4.

[Mark Millbauer]

Compression, Fuel, spark,all at the right time. You have ruled out compression. You didn't mess with timing so for now, let's rule that out too. You say fuel is good so I assume you are getting it to the carb. Check that but first, check for spark. New parts do not necessarily make things work. Check for spark at the plugs and let's work from there.

mark
C27 "Solution"

[Mo]

1. Do you have spark? I think you said previously that you did.
- wires on correctly
- Points gapped correctly.
- Ensure plugs gapped correctly
- Spark to all plugs...remove individually and ensure spark to the end...wear a glove and use a pliers to hold the plug (threaded area) against the head) N0 gas fumes or open gas when doing this Should see spark across gap at the end of the plug.
2. Next, are you getting fuel.
-Fuel shut-off valves etc open.
-Fuel pump delivering fuel?
-If suspect remove and clean carb...do next(3) step before hauling the carb apart.
3. Check Compression. (quick check) Pull the plugs out and hold your thumb over the plug hole as someone turns the engine over with the starter. Holding your thumb over the hole as tight as you can the compression should push your thumb up allowing the air to escape. If you have that on all four cylinders you have enough compression to start the engine.

I won't be around all day but will check back in tonight to see how it went.

[JOHN COOKSON]

Also chech to see if the choke is closing all the way.

TRUE GRIT