I have a 1977 Mercury 1500 outboard 150HP. It did seem to run fine at low speed but had no top end. (would only reach a top speed of 15-20MPH) I have a Seloc manual. And was going through the timing and synchronizing section. I tried to follow procedure and now it will not start.
This is what the manual states.
BELT TIMING
“ Remove the powerhead cowling. Remove all of the spark plugs as a safety measure. Observe the single dot (three dots on models 1150 and 1500 prior to 1978) alignment mark on the flywheel and the arrow cast on the distributor pulley. Remove the bolt, washers, pulley cove, and the belt. Now, rotate the flywheel clockwise until the alignment mark on the flywheel is aligned with the center of the distributor shaft.
Rotate the distributor pulley until the arrow is pointing at the flywheel alignment mark. Hold the pulley in this position and install the belt. Install the pulley cover, washers, and bolt Torque to 60 in lb.
My question in regards to this is (I have 3 dots on my flywheel 2 are together and one is by itself, they are on the edge of the flywheel are these the dots referred to?) what dot do I use?
TIMER POINTER ADJUSTMENT
“Install a dial indicator into the No.1 spark plug opening. Slowly rotate the flywheel clockwise until the No.1 piston is at top dead center. Set the dial indicator at 0. Slowly rotate the flywheel counter clockwise until the dial indicator needle is approximately ¼ - turn beyond the .464 mark. Now, slowly rotate the flywheel back clockwise until the dial indicator is at exactly at .464.
Adjust the timing pointer until the pointer is aligned with the .464 mark on the timing decal. Remove the dial indicator. Install the spark plugs.”
My question here is what is the .464 mark on a dial indicator? And what is meant by “dial indicator needle is approximately ¼ - turn beyond the .464 mark.”
David, Turn the flywheel until the top piston (number 1) is at top dead center, near as you can get. Now there should be a dot just about at the center of the distributor pulley, in the center of the edge of the flywheel. This dot also indexes the timing decal. Does your flywheel have the timing decal? If not, you need to create one to set the timing accurately.
OK now for setting the timing pointer. Measure the distance from the top of #1 piston to the edge of the cylinder head. Add .464 inches to it. Now turn the flywheel backward until the piston recedes more than the depth calculated. Now turn the flywheel forward until it get to the distance calculated. Now you can set the timing pointer to .464 before TDC.
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David, You should see a place on the timing decal where the aligned the decal with the dot. That is where the distributor pulley arrow should point, when the motor is at top dead center. BTW the timing pointer should point to the "TDC" line on the decal as well. If that decal is not in the front when the number one cylinder is at TDC, your flywheel may be installed incorrectly.
Chris, Thanks for the info, I will take a look at it this weekend to see if the flywheel is installed correctly. will let you know what I find. If you could describe how to how to fix it just incase it is not installed correcly it would be great.
Thanks again
David
To set the flywheel correctly: Set the top piston to top dead center as best as you can. if the dot on the flywheel (actually a punch mark) is not near the center of the distributor pulley, remove the eight 5/16" fine thread bolts clustered around the large (1-1/16??) flywheel nut. Now rotate the outer flywheel (inner flywheel should not move)until the dot lines up with the center of the dist. pulley. Reinstall the bolts and use some locktite on the threads.
Mercury 1500 150HP Timing and synchronizing
Re: Mercury 1500 150HP Timing and synchronizing
Re: Mercury 1500 150HP Timing and synchronizing
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