1986 merc xr2 150 will not run

[alphag36k]

hey all

i have a 86 or 84 merc 150 v6 that will not stay running at start up if i push in the choke and open the hand throttle all the way it will run at WOT for a few seconds then stall i cleaned the carbs put 2 sets of plugs in it cylinder copression is at 120PSI +-5PSI
new gas oil mix removed the oil injection new primmer ball i dunno what to do

 

[j_martin]

Re: 1986 merc xr2 150 will not run

In the book. Linkage and timing adjustment procedure.

 

[alphag36k]

Re: 1986 merc xr2 150 will not run

i will give that a shot gotta get a book im assuming your are talking about a service manual. gotta get one of those first. unless u happen to know what the timing should be set at at idle

 

[j_martin]

Re: 1986 merc xr2 150 will not run

The linkage and timing is a bunch of adjustments that are all interdependent. You sort of problem is usually caused by tinkering with it without thoroughly understanding how it works. The procedure starts from scratch, starting with mechanically checking the position of the timing pointer. It assumes the engine was just bolted together from spare parts and nothing is right. Probably pretty close to the condition of your engine.

For instance, idle timing is set at a base setting. When you start the engine it is usually slightly fast. The idle adjustment adjusts a different screw that moves the whole rack, but one of the things it affects is base idle timing.

When we fine tune them, as in change carbs, change jetting per cylinder, etc, we may mess with the timing, but we know what we are doing. Always you need to at least start with the book settings. In your case it'll probably be right where you want it.

 

[alphag36k]

Re: 1986 merc xr2 150 will not run

Thanks a bunch i do remember messing with one of the bolts on the throttle rack a little bit there is paint on it i might try just turning it back to where it was i didn't move it a whole lot. and what repair manuals do you suggest and where to get them?

 

[j_martin]

Re: 1986 merc xr2 150 will not run

Mercury factory service manual for your engine. Either look up the number in the parts list for your motor (by s/n) and try to buy used on eBay or Amazon, or just buy it outright where you buy mercury parts.

You probably aren't the first one to tinker with it.

Like I said, the adjustments are sequential and interdependent.

 

[alphag36k]

Re: 1986 merc xr2 150 will not run

thanks a bunch

 

[alphag36k]

Re: 1986 merc xr2 150 will not run

so i got it fixxed it runs now just put a new starter on it hooked it up to the hose and when i pump the ball gas leaks out of the top carb from the top front center 2 holes any ideas

 

[alphag36k]

Re: 1986 merc xr2 150 will not run

got the carbs to stop leaking simple fix bend the float tab down a little bit. the water coming out of the pee hole is still pretty hot 140ish degrees any ideas has a new water pump.

 

[j_martin]

Re: 1986 merc xr2 150 will not run

got the carbs to stop leaking simple fix bend the float tab down a little bit. the water coming out of the pee hole is still pretty hot 140ish degrees any ideas has a new water pump.

Do you own the manual yet?

All the water for the tell-tale goes through a t-stat first. If it wasn't 140ish, there'd be concern. You also might notice it takes from a few seconds to a minute for the tattle-tale to start up. That also is perfectly normal.