Poppet valve '99 Merc 150

[randlemanboater]

Today I also inspected the poppet valve, I think.

Anyone here know what it looks like?

http://i145.photobucket.com/albums/r222/randlemanboater/101_0097.jpg

http://i145.photobucket.com/albums/r222/randlemanboater/101_0101.jpg

http://i145.photobucket.com/albums/r222/randlemanboater/101_0100.jpg

Other than some small sea shells, I didn't see anything out of the ordinary, of course I've never seen a poppet valve so I have no idea.

[randlemanboater]

Today I also inspected the poppet valve, I think.

Anyone here know what it looks like?

http://i145.photobucket.com/albums/r222/randlemanboater/101_0097.jpg

http://i145.photobucket.com/albums/r222/randlemanboater/101_0101.jpg

http://i145.photobucket.com/albums/r222/randlemanboater/101_0100.jpg

Other than some small sea shells, I didn't see anything out of the ordinary, of course I've never seen a poppet valve so I have no idea.

[msbhammer]

Randleman, your learning quick. Good Job. ;D

[msbhammer]

Randleman, your learning quick. Good Job. ;D

[randlemanboater]

I learned today that if you pick up your camera with grease on your hands, your camera gets grease on it.

[randlemanboater]

I learned today that if you pick up your camera with grease on your hands, your camera gets grease on it.

[msbhammer]

LOL, Ahhh, that was funny as hell. ;D ;D ;D

[msbhammer]

LOL, Ahhh, that was funny as hell. ;D ;D ;D

[C YENSEN]

I learned today that if you pick up your camera with grease on your hands, your camera gets grease on it.

That is a hard lesson to learn, I have been there, wait till you have to explain it to the wife......lets just say she bought a new camera and gave me the greasy one. :'(

[C YENSEN]

I learned today that if you pick up your camera with grease on your hands, your camera gets grease on it.

That is a hard lesson to learn, I have been there, wait till you have to explain it to the wife......lets just say she bought a new camera and gave me the greasy one. :'(

[C YENSEN]

Sorry.....but before this thread gets totally hijacked......I am sorry but I am not an OB guy. I have no idea what that valve is supposed to look like. I am sure Skools, or MJ will be along shortly. ;D

[C YENSEN]

Sorry.....but before this thread gets totally hijacked......I am sorry but I am not an OB guy. I have no idea what that valve is supposed to look like. I am sure Skools, or MJ will be along shortly. ;D

[Blue_Runner]

I don't know what they look like either but I found this

Poppet Valve Kit for Mercury:
http://www.colortomorrow.com/obimages/8030.jpg

[Blue_Runner]

I don't know what they look like either but I found this

Poppet Valve Kit for Mercury:
http://www.colortomorrow.com/obimages/8030.jpg

[Blue_Runner]

More poppet research. Commentary on someone elses problem:
Did you check the poppet valve and springs?? Double-circular cover on the lower starboard side of the block, held on by 4 (maybe 5) bolts. I believe you will find it helpful to remove the lower motor cover on that side in order to gain access. The poppet controls cooling water flow for hi-speed operation, is supposed to unseat and flow max water around 2500 rpm's (?? I think).
-John

This sure sounds like the poppet valve problem. When that valve is working correctly, you can watch the temp gauge climb to about 3/4 at high idle speed. At around 2500 rpm when water pressure builds, the gauge will drop rapidly down to 1/4 when the valve opens up, and the temp will stay down there up to WOT. Your new water pump eliminated that as a problem source, leaving other things to look for. Other than poppet valve, the other possibility is some kind of blockage in the cooling passages. Pulling the heads off and checking the water jackets is called for there. With a motor that old used in salt, replacing the head gaskets is not a bad idea anyway. Because it is easier to replace or clean the poppet valve assembly than it is to pull the heads, I would look at the valve next. Not sure about the big blocks, but with the small block V6s, you have to remove the lower engine cowl to get to the valve assembly. Problems like this are a process of elimination. With a used motor of unknown history, replacing these components as you go through the elimination process leads to peace of mind and confidence in your power plant.

[Blue_Runner]

More poppet research. Commentary on someone elses problem:
Did you check the poppet valve and springs?? Double-circular cover on the lower starboard side of the block, held on by 4 (maybe 5) bolts. I believe you will find it helpful to remove the lower motor cover on that side in order to gain access. The poppet controls cooling water flow for hi-speed operation, is supposed to unseat and flow max water around 2500 rpm's (?? I think).
-John

This sure sounds like the poppet valve problem. When that valve is working correctly, you can watch the temp gauge climb to about 3/4 at high idle speed. At around 2500 rpm when water pressure builds, the gauge will drop rapidly down to 1/4 when the valve opens up, and the temp will stay down there up to WOT. Your new water pump eliminated that as a problem source, leaving other things to look for. Other than poppet valve, the other possibility is some kind of blockage in the cooling passages. Pulling the heads off and checking the water jackets is called for there. With a motor that old used in salt, replacing the head gaskets is not a bad idea anyway. Because it is easier to replace or clean the poppet valve assembly than it is to pull the heads, I would look at the valve next. Not sure about the big blocks, but with the small block V6s, you have to remove the lower engine cowl to get to the valve assembly. Problems like this are a process of elimination. With a used motor of unknown history, replacing these components as you go through the elimination process leads to peace of mind and confidence in your power plant.

[phatdaddy]

RMB, how d id you pull the lower cowling pan. I need to get to my steering arm to clean and paint.

[phatdaddy]

RMB, how d id you pull the lower cowling pan. I need to get to my steering arm to clean and paint.

[randlemanboater]

RMB, how *d id you pull the lower cowling pan. *I need to get to my steering arm to clean and paint.


There are 4 bolts holding the 2 pieces together, 2 in the back inside the cowling, one in the front inside and one in the front outside, right near the pivot point. I had to remove the airbox to get the front inside one out, the rest were no prob. The it is a rasslin (wrestling for you yanks) match to pull the covers off of the rubber mounts, for each side pull straight towards the sides of the boat

[randlemanboater]

RMB, how *d id you pull the lower cowling pan. *I need to get to my steering arm to clean and paint.


There are 4 bolts holding the 2 pieces together, 2 in the back inside the cowling, one in the front inside and one in the front outside, right near the pivot point. I had to remove the airbox to get the front inside one out, the rest were no prob. The it is a rasslin (wrestling for you yanks) match to pull the covers off of the rubber mounts, for each side pull straight towards the sides of the boat

[randlemanboater]

I don't know what they look like either but I found this

Poppet Valve Kit for Mercury:
http://www.colortomorrow.com/obimages/8030.jpg

HHHHMMMMM, looks like I will be opening that back up cause I didnt find all that stuff.

[randlemanboater]

I don't know what they look like either but I found this

Poppet Valve Kit for Mercury:
http://www.colortomorrow.com/obimages/8030.jpg

HHHHMMMMM, looks like I will be opening that back up cause I didnt find all that stuff.

[Airslot]

Randleman, It looks to me like a hack may have gotten ahold of your motor in its previous life. Your t-stats have been hollowed out and your poppet valve has been removed. I think they were chasing cooling issues before you got ahold of it.

JMO

Airslot

[Airslot]

Randleman, It looks to me like a hack may have gotten ahold of your motor in its previous life. Your t-stats have been hollowed out and your poppet valve has been removed. I think they were chasing cooling issues before you got ahold of it.

JMO

Airslot

[msbhammer]

Ok, what does the poppet valve do. I know it has to do with cooling, but does it regulate the amount of water through the heads ????

[msbhammer]

Ok, what does the poppet valve do. I know it has to do with cooling, but does it regulate the amount of water through the heads ????

[randlemanboater]

Mine doesnt do anything.

Its supposed to open up to allow more waterflow through the motor above 2500 rpm.

[randlemanboater]

Mine doesnt do anything.

Its supposed to open up to allow more waterflow through the motor above 2500 rpm.

[randlemanboater]

Randleman, It looks to me like a hack may have gotten ahold of your motor in its previous life. *Your t-stats have been hollowed out and your poppet valve has been removed. *I think they were chasing cooling issues before you got ahold of it.

JMO

Airslot

I agree Air. I hope I fixed it.

[randlemanboater]

Randleman, It looks to me like a hack may have gotten ahold of your motor in its previous life. *Your t-stats have been hollowed out and your poppet valve has been removed. *I think they were chasing cooling issues before you got ahold of it.

JMO

Airslot

I agree Air. I hope I fixed it.

[macojoe]

Sorry but I have never had to deal with one so I have no idea??

This is a Skool or BS question :-/

[macojoe]

Sorry but I have never had to deal with one so I have no idea??

This is a Skool or BS question :-/

[randlemanboater]

Looking back @ my pics, I think I just didn't pull the rest of the valve out of the side of the block (looking at the right side of the housing).

[randlemanboater]

Looking back @ my pics, I think I just didn't pull the rest of the valve out of the side of the block (looking at the right side of the housing).

[Airslot]

After looking at the pics, I agree, the rest of the valve is still in there. I'd pull it to check for sand, etc.

I'd also put T-stats back in . You can pick them up for about 30 for the pair

[Airslot]

After looking at the pics, I agree, the rest of the valve is still in there. I'd pull it to check for sand, etc.

I'd also put T-stats back in . You can pick them up for about 30 for the pair

[phatdaddy]

RMB, Don't confuse me with the northern members of the tribe, I am well aquainted with boiled peanuts & pot likker.

My steering arm is very corroded and I need to pull the pan to get to it.

Thanks

[phatdaddy]

RMB, Don't confuse me with the northern members of the tribe, I am well aquainted with boiled peanuts & pot likker.

My steering arm is very corroded and I need to pull the pan to get to it.

Thanks

[randlemanboater]

MMMMMMMMMMMMMMMMMMMMMM boiled peanut season is just around the corner!!!!!!!! ;D

As you can see, my steering arm is in bad shape as well, hope it is easy to replace. But that will be another thread.

[randlemanboater]

MMMMMMMMMMMMMMMMMMMMMM boiled peanut season is just around the corner!!!!!!!! ;D

As you can see, my steering arm is in bad shape as well, hope it is easy to replace. But that will be another thread.

[phatdaddy]

do you have a temp and or pressure gauge? If not & you keep this motor, they are an easy install and give you good info. With a new impeller i get 12 \15 psi @4000 rpm. When it drops to below 9 I put a new one in, or once a spring, not only for cooling, but to keep the drive shaft lubed.

[phatdaddy]

do you have a temp and or pressure gauge? If not & you keep this motor, they are an easy install and give you good info. With a new impeller i get 12 \15 psi @4000 rpm. When it drops to below 9 I put a new one in, or once a spring, not only for cooling, but to keep the drive shaft lubed.

[randlemanboater]

All I have is the buzzer, but I am not keeping it so I will suggest that to the new owner.

[randlemanboater]

All I have is the buzzer, but I am not keeping it so I will suggest that to the new owner.

[phatdaddy]

i'll be glad to haul it off for you, i won't even charge you a disposal fee.

[phatdaddy]

i'll be glad to haul it off for you, i won't even charge you a disposal fee.