1989 70hp mercury will not start!

Rinker

Cadet
Joined
Jul 7, 2002
Messages
6
I was out running for an hour,stopped for a break,my wife went to restart it and it just cranked so I switched :confused: gas tanks and pumped the ball and I tried to start it pushing the key in,no start.I asked her if she pushed the key in while cranking she said yes.<br /> I said it must be flooded,we waited I tried again later and the same no start.So we were towed 6 miles to our ramp by a family member,at that time I was trying with choke without choke finaly I gave up.<br /> Next day pulled plugs,they were gas wet,so I put clean used plugs in crank,no start,remove plugs they were wet ,so I removed the plugs cranked it without plugs thinking it would clean out the cylinders,blew out the holes with air,installed New plugs,crank it no start.Now I have checked for spark several times on all clinders and have good spark,I also checked compression an even 115psi, I am lost I have fuel spark and compression but It wont start ,it just wets the plugs with fuel? it ran normal before and aways starts instantly
 

BKool68

Petty Officer 1st Class
Joined
Oct 14, 2001
Messages
259
Re: 1989 70hp mercury will not start!

You may have sheared a flywheel key.
 

Rinker

Cadet
Joined
Jul 7, 2002
Messages
6
Re: 1989 70hp mercury will not start!

Thanks I will go out and check it. Any ideas are helpful!
 

russthemuss

Petty Officer 2nd Class
Joined
Jan 16, 2002
Messages
101
Re: 1989 70hp mercury will not start!

Make sure its cranking fast enough.
 

Rinker

Cadet
Joined
Jul 7, 2002
Messages
6
Re: 1989 70hp mercury will not start!

I have no way of removing the flywheel nut its too tight, but I looked at the prop and it smells of GAS? Im lost here , compression,spark, fuel, no start just floods,I called the dealer but they can not look at it for 2 weeks! :confused:
 

Trent

Captain
Joined
Nov 17, 2001
Messages
3,333
Re: 1989 70hp mercury will not start!

Im with Russthemuss..<br /><br />Connect jummper cables to your battery and re-test! These engines MUST have full cranking speed to start correctly!
 

Rinker

Cadet
Joined
Jul 7, 2002
Messages
6
Re: 1989 70hp mercury will not start!

:rolleyes: now I have no spark ,I checked it with plugs in and put a new plug to the wire and ran a ground to the plug cranked it and no spark ? oh well boat goes in this weekend to the dealer.I hope it does not cost a mint to get floating again summer is passing me by and I have a dead boat :mad:
 

Rinker

Cadet
Joined
Jul 7, 2002
Messages
6
Re: 1989 70hp mercury will not start!

It Runs again! :eek: Here it had spark all along the trouble was said to be water in fuel !(Long Story!)
 
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