79 mercury 90 hp tilt trim

[bigl]

got 79 mercury 90 hp in the shop having carbs rebuilt scared to try that an we asked them to check trim bleeds off it was dads boat hes gone now rip. but he had new trim moter an clyanoids put on last year goes up down fine ust leaks off guy at shop called today said 350.00 for carbs rebuilt bought right i think but anyway said about 800.00 fix tilt an trim sounds little high to me acks like just got air init to me what all does fiill tank consist of iis there any place to get a diagram of it once again tks wish you techs was around ere i love this websight an trust all you gentleman

 

[Chris1956]

Re: 79 mercury 90 hp tilt trim

You might try to form complete sentences. I cannot understand the question(s).

 

[bigl]

Re: 79 mercury 90 hp tilt trim

Sorry guys didn't get to finish school had to work. anyway got a mercury 79 model 90 hp with tilt an trim with duel cylinders on motor an pump on the inside of boat. an it bleeds off after about 5 are 10 min the lines are all tight an my dad just put new trim motor an 2 solenoid's on it last year. the boat shop called yesterday said it would cost $800.00 to fix sounds little high to me . is there anywhere where i can get a diagram of the pump are bye the parts at to rebuild it myself tks in advance . ps. this little spell thing program is all that

 

[Chris1956]

Re: 79 mercury 90 hp tilt trim

There are two reasons that system will bleed down. The first is bad teflon seals on the pistons inside the PTT cylinders. There are complete rebuild kits avail for <$50/each cylinder. The second reason is a bad control valve, but this is more remote. The answer to this problem is to replace the control valve.

The price quoted to you is outrageous. I recommend another shop.

BTW the teflon seals need a special tool to install them. The tool is like a ring compressor. The rest of the PTT cylinder parts install w/o any issue. Is there any oil leaking out of the piston rod to cylinder joint?

 

[bigl]

Re: 79 mercury 90 hp tilt trim

no there is no oil leaking anywhere sounds good goes up an down fast just bleeds back down . where is this control switch you talked about might look into that before i order the rebuild kit. also the guy at the boat shop called today an wanted to know if we had carbs apart witch we have not an said he pulled them off to rebuild an on all 3 carbs the main jets were missing .we've had it out on lake 4 times ran decent we just had to spray fuel oil mix in carbs to start .is that posable to run like that .anyway tks once again.

 

[Chris1956]

Re: 79 mercury 90 hp tilt trim

It is doubtful that the motor will run w/o main jets. They are located under the brass plugs in the base of the carb. I suspect he doesn't know the difference between the main jets and the backdrag jets in the carb bowl covers.

The control valve is on the base of the pump resevoir. It is where the hoses attach. There are no rebuild kits, nor adjustments for it.