'88 50hp will not start after anchor line fouled prop

cbercaw

Petty Officer 2nd Class
Joined
Jun 15, 2008
Messages
114
Hello guys,
My '88 50hp has been running great last fall and this spring thanks to this Iboats forum. I have had it out about 5 times in the past 6 weeks or so. In that time she started great and had no problems and like i said, was running better than ever before. So....I anchored up to fish a little, long story short, when I was idling out of my fishing spot, my anchor line fouled my prop and stalled the engine :facepalm:. After clearing the line and making sure the prop wasn't bent, I made sure it spun in neutral (and caught in F/R). Next the engine started fine to my relief. I motored down river to another fishing spot.
When I got to my next spot, I ended up helping out a fishing boat. This 40' chesapeake crabbing boat needed a tow. I towed them for about thirty minutes at idle speed. she shuddered a little at the end of the tow and i had to increase throttle to maintain previous rpms.
Both incidents occurred within an hour. After my initial start (post anchor line), the engine was increasingly hard to get into gear without stalling. It was increasingly difficult to start after the tow.
Now, it will start and stall intermittently on fast idle. It stalls going into gear. Sometimes I eventually got her to go by running a high idle and then punching her into gear without stalling.
I am not sure which event affected the engine or if it was a combination. Tonight I tried cleaning the carb and still have the same starting problem. It basically wont run for more than a second or two. Apologies for the long post I only wanted to give you as much information as I could. Maybe someone has had a similar experience. MY engine is 1988 50hp 15' boat towing a 40' er. and I ran over my own anchor line. What a day... thanks Chris
 

pnwboat

Rear Admiral
Joined
Oct 8, 2007
Messages
4,251
Re: '88 50hp will not start after anchor line fouled prop

Sounds like the motor is starved for fuel. Have you checked/replaced the fuel pump diaphragm? See if squeezing the primer bulb or choking it helps to keep it running.

I doubt getting tangled up in the anchor line would do anything to the motor. Towing a 40' boat is another thing but as long as it didn't overheat the motor, you should be OK. Might also do a compression check to make sure there's no damage to the rings/pistons, or head gasket.
 

cbercaw

Petty Officer 2nd Class
Joined
Jun 15, 2008
Messages
114
Re: '88 50hp will not start after anchor line fouled prop

Do you think the timing could have been thrown off when the prop fouled and stalled the engine
 

pnwboat

Rear Admiral
Joined
Oct 8, 2007
Messages
4,251
Re: '88 50hp will not start after anchor line fouled prop

Only way that could happen is if the flywheel keyway was sheared and the flywheel has rotated out of position. Easy to check with a timing light.
 

cbercaw

Petty Officer 2nd Class
Joined
Jun 15, 2008
Messages
114
Re: '88 50hp will not start after anchor line fouled prop

What is the procedure for checking timing? My manual was destroyed. Copy or photo anyone?
 

riptorn

Chief Petty Officer
Joined
Mar 8, 2012
Messages
433
Re: '88 50hp will not start after anchor line fouled prop

You made no mention on checking your plugs for fouling. Is your over heat alarm working?
 

cbercaw

Petty Officer 2nd Class
Joined
Jun 15, 2008
Messages
114
Re: '88 50hp will not start after anchor line fouled prop

Plugs were ok but changed anyway. My overheat alarm does not work. I have a water temp gauge and visible telltale. I did a new water pump kit this spring. I will check compression and spark tonight.
 

cbercaw

Petty Officer 2nd Class
Joined
Jun 15, 2008
Messages
114
Re: '88 50hp will not start after anchor line fouled prop

She ran at 130-140 degrees f..this is normal operating temp...telltale had normal stream...I do not believe her to have overheated.
 

bentle

Chief Petty Officer
Joined
Aug 2, 2011
Messages
492
Re: '88 50hp will not start after anchor line fouled prop

This sounds fuel related. Check your fuel pump, fuel filter and verify the primmer bulb
stays firm after a prime. If the bulb is going flat while running then check fuel vent for plugging, fuel pickup tube pre screen may be plugged.
As already stated do a compression and spark test on all cylinders.
Don't mess with the timing unless its last resort and a good manual for your motor in hand.
 

tater76

Senior Chief Petty Officer
Joined
May 7, 2010
Messages
712
Re: '88 50hp will not start after anchor line fouled prop

If it were me, I would pull the flywheel and check the key. Also, if your 88 has cdi ignition you can do as follows.

If you have a standard automotive timing light its an easy process. This is how I do it, but is not gospel... pull both spark plugs out of the engine, insert them into the spark plug boots, take my y shaped custom ground wire and attach to both plugs tightly, then ground the other end of wire to engine ground.
Now you have to bypass the interlock switch, I use a jumper wire connected to both end terminals of the switch. Connect the positive and negative leads of the timing light to the boats battery, you get in the boat, point the timing light at the flywheel straight on. Note the timing mark plate on top of the block, get a buddy, have buddy put the boat into wide open throttle, then have buddy crank the engine while you pull the trigger on the timing light. The pointer line mark should line up with the 28 degree line on the flywheel. The lines on the flywheel (left to right) 28,30,32 degrees.

If not at 28 adjust the coupler at the top of the tower, just under the flywheel, until you get it. This is static timing, and will equal 32 degrees wot on the water as specified by the manual. And if im missing something please feel free to add.
 

eight tracker

Petty Officer 3rd Class
Joined
May 12, 2009
Messages
81
Re: '88 50hp will not start after anchor line fouled prop

also check and see if the seal in the lower uinit may of gotten damaged somehow by tow rope or fishing line letting oil leak out there by causing the lower unit to seize up when it gets hot,my 1/2 cent worth.
tom
 
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