replacing poppett valve

[hl]

When removing the cover of the poppett valve I found what appears to be an old gas hose cut to about 1 to 2 inches with a bolt pushed in the middle which seems to block water from entering into a hole. This was located to the left of the main assembly. I can not find anything in the manual about this. Someone please advise me if this rig should be there or not. This is 1987 150 xr4

 

[Maxz695]

Re: replacing poppett valve

It does not belong there theey put that there to stop water from coming out the top of the popet a simple small tap screw woulda done the job thats waht I did remove that crap it interferes with water flow. either replace the popit or do like i did tap screw in top little hole seals right up

 

[hl]

Re: replacing poppett valve

Thanks. I replaced the valve without the rig I found. I saw a small hole in the outer cover. Is this the hole you were saying to tap with a screw?

 

[Maxz695]

Re: replacing poppett valve

NO!! not if you put in a new popit kit. It has a diapham that doesn,t let water get by that hole is a releif valve so when it sputters (pops)air goes out that hole it,s like an air cusion (Spring to deter the pressure from the backfire. If you DID NOT Put a new popit kit in there then I would put a little tap screw in there to stop the water from leaking out of it

 

[hl]

Re: replacing poppett valve

I replaced the valve. I will try it tomorrow. Thanks for the information.

 

[Maxz695]

Re: replacing poppett valve

just for my info did you check or change the thermostat under the housing there while you where at this popit valve? By the way that thig was the last owner probably removed that too

 

[Faztbullet]

Re: replacing poppett valve

Was the hose and bolt on a elbow on the cover? If so that hose was a feed from the top of block. Also there is no t-stat under poppet cover on a V-6.....

 

[Maxz695]

Re: replacing poppett valve

RE first post quote " I found what appears to be an old gas hose cut to about 1 to 2 inches with a bolt pushed in the middle which seems to block water from entering into a hole". This would be by discripton a bock just like they used to do to block off vaccume hoses on older carburetors on cars . I do not believe Mercury would use this typ of FIX It on there motors. If this where the cas then at least it would most certainly have a stainless steel bolt. so I ask the poster was it a steel bolt. Just to be sure I assumed correctly what was stated. I would hate to misllead you if this was a nessecary part. I used this type of set up with a coper line and a solderd adapter to 1/2 inch to connect to a garden hose to backflush my engine through the popit hole wich is exactly fuel line in size (By the way it worked very well

 

[hl]

Re: replacing poppett valve

RE first post quote " I found what appears to be an old gas hose cut to about 1 to 2 inches with a bolt pushed in the middle which seems to block water from entering into a hole". This would be by discripton a bock just like they used to do to block off vaccume hoses on older carburetors on cars . I do not believe Mercury would use this typ of FIX It on there motors. If this where the cas then at least it would most certainly have a stainless steel bolt. so I ask the poster was it a steel bolt. Just to be sure I assumed correctly what was stated. I would hate to misllead you if this was a nessecary part. I used this type of set up with a coper line and a solderd adapter to 1/2 inch to connect to a garden hose to backflush my engine through the popit hole wich is exactly fuel line in size (By the way it worked very well

It was a steel bolt and it was some sort of rig I fell to see the purpose for. I took the boat out Friday and the over heat alarm did not go off once(which has been an issue off and on since I bought the boat last summer. Hope this solves the problem. Thanks for the advice.

 

[j_martin]

Re: replacing poppett valve

Fog clearance time.

Totally ignore smoke from maxz.

Pictures would help, but I suspect that if there is a hose barb on the poppet valve cover, it is supposed to be connect to the water pressure fitting on the top of the block just aft the flywheel. The water pressure gauge also connects there. I believe the hose is a pressure reference for the poppet valve and doesn't actually flow much water.

The thermostats are near the top of the head, one on each head. The outlet from them is connected to a T, which dumps the t-stat water to a fitting in the base plate and then into the mid. The tell-tale is sampled off that line.

Odds are the original owner didn't know what he was doing, and either removed the t-stats entirely, or replaced them with washers or the wrong stats. Would be a good ideal to look under the t-stat covers and see what gives.

Put it all back to stock, and go from there. If water pressure and cooling are normal, Yer done. If water pressure is a little high and it's a little warm, then you put a tropical spring in the poppet assembly to fix it. You can also trim a bit off the stock spring. Not to be taken lightly, you can't put it back without replacing the spring.

Water flow diagram in this thread.
http://forums.iboats.com/showthread.php?t=233833&page=1

hope it helps
John

 

[Maxz695]

Re: replacing poppett valve

your welcome RE SMOKE HUGH lol J because we are still in the dark although the problem has seemingly been repaired with a possitive result can you answer just one mor question to clearify something? Question: Was the hose with the screw it it under the Popit cover inside or coming off from the ouside of the popit? thanks for the repy when given

 

[hl]

Re: replacing poppett valve

your welcome RE SMOKE HUGH lol J because we are still in the dark although the problem has seemingly been repaired with a possitive result can you answer just one mor question to clearify something? Question: Was the hose with the screw it it under the Popit cover inside or coming off from the ouside of the popit? thanks for the repy when given

The hose/bolt rig was inside the cover to the left of the popett valve. Last summer when the motor started to overheat I checked the therostats and found that someone had taken them out put it back together without therostats. The water gage was reading 15-18 psi last year. After I replaced the poppett valve and removed the hose/bolt rig the plessure shows a little over 10 psi at 3000 rpm. I think this is a little low.

 

[Maxz695]

Re: replacing poppett valve

Thank you chalk one up for MAX695 Smoke MY *** and chalk 2 up for MAX695 this does have a thermostat. chalk three up for Max695 water restriction. 4 change the impeller it,s weak!

 

[j_martin]

Re: replacing poppett valve

Actually, that's about right on the pressure, though it should climb a bit as you go up from there. It should go up to around 12 at 3000 rpm or so, then drop back a couple of lbs when the poppet opens. My engine, (exactly the same) has no hose from the top to the poppet like '89+ engines do.

So, poppet valve serviced, proper t-stats installed, pressure gauge reads near 0 when engine is stopped.

What is your water pressure at idle, 2000, 3000, 4000, 5000,and WOT?

Should be about off the peg, 8, 12, 12, 15, 18. It can vary quite a bit, but should not be 0 at idle, or either real low or real high at WOT. It should ramp up till the poppet opens, then drop back noticeably and ramp up again.

The little hole in the poppet cover is just an atmospheric pressure reference for the diaphragm. If water comes out the hole, the diaphragm is bad. It is required. Don't plug it.

hope it helps
John

 

[Maxz695]

Re: replacing poppett valve

TY for the comeback and the reference J no hard fellings I just don,t like being bashed for no reason. RE first post by poster quote " When removing the cover of the poppett valve I found what appears to be an old gas hose cut to about 1 to 2 inches" End of story!!!!

 

[Maxz695]

Re: replacing poppett valve

This will be my last post of this evening : If I was wrong Trust Me I would be the first one to admit it. Not many people can do that. There ego and there confidence won,t allow it. So with that I bid all well and a safe happy boating expirience. We all need wach other. Thats why where here