Thermastat 3.0

[ktbarrentine]

Re: Thermastat 3.0

If you are referring to the vertical shaft that has the impeller on it, then a follow-on question is: have you installed the impeller and the pump base, plates, key, components correctly per the instructions in the manual? And did you lubricate the impeller and turn the shaft clockwise while installing the pump housing to properly set the vanes? It may be that the impeller is giving too much resistance, if it is dry. If it is lubed, then it may be an assembly issue or a gear jam. With the impeller properly installed and lubed up, you should be able to put the shift shaft fully clockwise while turning the prop counterclockwise to lock the clutch dog, then continue to turn the prop CCW to turn the vert shaft CCW. Conversly, in fwd, you should be able to turn the vert shaft CW while keeping a slight load on the prop (CCW load), and the prop will turn CW. If this isnt happening, then you have bigger issues. Were you able to turn the shaft before the impeller change-out?

 

[jtracc]

Re: Thermastat 3.0

If you are referring to the vertical shaft that has the impeller on it, then a follow-on question is: have you installed the impeller and the pump base, plates, key, components correctly per the instructions in the manual? And did you lubricate the impeller and turn the shaft clockwise while installing the pump housing to properly set the vanes? It may be that the impeller is giving too much resistance, if it is dry. If it is lubed, then it may be an assembly issue or a gear jam. With the impeller properly installed and lubed up, you should be able to put the shift shaft fully clockwise while turning the prop counterclockwise to lock the clutch dog, then continue to turn the prop CCW to turn the vert shaft CCW. Conversly, in fwd, you should be able to turn the vert shaft CW while keeping a slight load on the prop (CCW load), and the prop will turn CW. If this isnt happening, then you have bigger issues. Were you able to turn the shaft before the impeller change-out?

I didn't lube the imPeller that's prob why. I can Pull off the water pump again and try to lube it. I believe it spun before I installed the impeller.

 

[jtracc]

Re: Thermastat 3.0

Any tips on getting this lower unit back on? It is ridiculously heavy. Looks like need 2nd person to help

 

[ktbarrentine]

Re: Thermastat 3.0

Definitely get help if you think it will become unweildy at all. That is why I always take the whole drive off (on a transport stand) and then lift the upper off the lower. A one-man show all the way around. Besides that, it is much easier to mate the halves together if you can look inside at the vertical shaft while it is going back together. In any event, yes, get a helper and take your time.
I am assuming you fixed the issue with the shaft not turning?

 

[achris]

Re: Thermastat 3.0

Any tips on getting this lower unit back on? It is ridiculously heavy. Looks like need 2nd person to help

Nah, it's not. Just make sure the drive is tilted all the way up, then come in from the side, line up the drive shaft and water tube, push it up. When it stops about 1/2" short of fully home, turn the prop CCW a little and the splines with line up... once it's in place, put the front nut on it's stud and let the housing go, it will stay there while you put the nuts and bolts in....

One question.... did you (or did you not) use the water pump housing alignment pins like the service manual instructed? (manual #14, page 3B-76, step 5)

 

[oldjeep]

Re: Thermastat 3.0

Nah, it's not. Just make sure the drive is tilted all the way up, then come in from the side, line up the drive shaft and water tube, push it up. When it stops about 1/2" short of fully home, turn the prop CCW a little and the splines with line up... once it's in place, put the front nut on it's stud and let the housing go, it will stay there while you put the nuts and bolts in....

One question.... did you (or did you not) use the water pump housing alignment pins like the service manual instructed? (manual #14, page 3B-76, step 5)

Stud? Mine uses a bolt. I usually have one of the kids get a couple of the bolts installed while I hold the lower unit up. Its not really that heavy, just hard to one hand and install the bolts.

 

[jtracc]

Re: Thermastat 3.0

i havent had it cloes enough to the drive to use the pins. i cant get it up due to the wieght and me being by myself.

 

[achris]

Re: Thermastat 3.0

Stud? Mine uses a bolt. I usually have one of the kids get a couple of the bolts installed while I hold the lower unit up. Its not really that heavy, just hard to one hand and install the bolts.

Yes, stud (or at least there should be!)... At the front of the drive, just a single stud, has a 7/16" UNF stainless steel nyloc nut on it (uses a 5/8" spanner). Just in front of the shift shaft. Get that one on and you can take your time with the rest of the nuts and bolts....

 

[achris]

Re: Thermastat 3.0

i havent had it cloes enough to the drive to use the pins. i cant get it up due to the wieght and me being by myself.

nope... Water pump housing... You should have used alignment pins to get the housing, plate and gaskets correctly aligned. At least tell me you used a seal height installation tool for the face seal on the top of the housing.... AS PER THE MANUAL!!!

 

[oldjeep]

Re: Thermastat 3.0

Yes, stud (or at least there should be!)... At the front of the drive, just a single stud, has a 7/16" UNF stainless steel nyloc nut on it (uses a 5/8" spanner). Just in front of the shift shaft. Get that one on and you can take your time with the rest of the nuts and bolts....

Ah, ok - I was thinking about the wrong end of the drive

 

[jtracc]

Re: Thermastat 3.0

nope... Water pump housing... You should have used alignment pins to get the housing, plate and gaskets correctly aligned. At least tell me you used a seal height installation tool for the face seal on the top of the housing.... AS PER THE MANUAL!!!

You have mistaken me for a marina. I watched a 100 videos and havent seen anyone use any alignment tools.

 

[achris]

Re: Thermastat 3.0

You have mistaken me for a marina. I watched a 100 videos and havent seen anyone use any alignment tools.

How have I mistaken you for a marina? And what does that mean anyway? Just because some other fools choose to ignore instructions issued by the manufacturer of the equipment you're working on doesn't mean you need to as well... I am a factory trained Mercruiser technician, and let me say that there are very good reasons to follow the book, such as risking damage to the pump housing, the lower drive shaft and an overheat on the engine.... But if you wish to follow that path.... don't let me stop you.

 

[ktbarrentine]

Re: Thermastat 3.0

How have I mistaken you for a marina? And what does that mean anyway? Just because some other fools choose to ignore instructions issued by the manufacturer of the equipment you're working on doesn't mean you need to as well... I am a factory trained Mercruiser technician, and let me say that there are very good reasons to follow the book, such as risking damage to the pump housing, the lower drive shaft and an overheat on the engine.... But if you wish to follow that path.... don't let me stop you.

I am assuming this (not using the alignment pins) is the reason he had problems with the ability to turn his vertical shaft after the impeller install... I still have not heard how that situation got resolved....:facepalm:

 

[jtracc]

Re: Thermastat 3.0

I am assuming this (not using the alignment pins) is the reason he had problems with the ability to turn his vertical shaft after the impeller install... I still have not heard how that situation got resolved....:facepalm:

Shaft spun but was tough, I greased the inside of the pump housing and she spins beautiful. I followed these directions. Don't see any alignment tool used .

http://forums.iboats.com/attachment.php?attachmentid=113738&stc=1&d=1316021388

 

[ktbarrentine]

Re: Thermastat 3.0

Shaft spun but was tough, I greased the inside of the pump housing and she spins beautiful. I followed these directions. Don't see any alignment tool used .

http://forums.iboats.com/attachment.php?attachmentid=113738&stc=1&d=1316021388

Jtracc.... Reviewed your link....



If you did as you said, then you followed steps 5 and 6 on page 3B-76, which refers to the pump housing alignment "pins" (note, "pins" not "tools") that are used to set the pump housing, then are removed when you install the bolting.


And then you went on to install the face seal on top of the pump housing using the required "setting tool" in step 7...right?

Just so you have the whole thing, here's the link to your service manual. Comes in handy....

https://docs.google.com/file/d/0B4X...yLWFmNzgtMTBmMzhlNGY4Mzk3/edit?hl=en_US&pli=1

 

[jtracc]

Re: Thermastat 3.0

Jtracc.... Reviewed your link....



If you did as you said, then you followed steps 5 and 6 on page 3B-76, which refers to the pump housing alignment "pins" (note, "pins" not "tools") that are used to set the pump housing, then are removed when you install the bolting.


And then you went on to install the face seal on top of the pump housing using the required "setting tool" in step 7...right?

Just so you have the whole thing, here's the link to your service manual. Comes in handy....

https://docs.google.com/file/d/0B4X...yLWFmNzgtMTBmMzhlNGY4Mzk3/edit?hl=en_US&pli=1

In the link I posted there is no mention of any pins or alignment pins so I have no idea what you're talking about. I followed all the steps in the link I have posted. There are no pins I did not use any alignment tools or special tools all i used were my hands and wrenches, i did set the seal on top of the housig with the provided tool, but all that tool does is push it down so it rests on the housing. if that is wrong oh well it happens I am sure it will be fine considering I have seen a lot people do it the way I have. Second, if that way is wrong why is it on a sticky, I suggest a immediate removal of a "how to" that's wrong

 

[oldjeep]

Re: Thermastat 3.0

I have no idea what you're talking about. I followed all the steps in the link I have posted. There are no pins I did not use any alignment tools or special tools all i used were my hands and wrenches

FWIW - the manual says "On early models, install the two (2) water pump locating pins through the gaskets and
face plate."

I've never used any pins on mine but would not describe it as an early model. Can't quite figure out why they would be required since any monkey can line up a couple holes in a gasket/plate/housing.

The seal "tool" Came with the quicksilver/merc kit I used last and there are directions in the kit, so there is really no need for the manual anyways.

 

[Don S]

Re: Thermastat 3.0

Those pins aren't "Required" but they do make the job a bit easier. Just cut the heads off a couple of bolts about about 2 inches long and instant alignment pins. Keeps the gaskets and bottom plate from sliding around while you turn the shaft to push the housing down.

They are like that tool used to hold the shift slide in place. You can do the job without it too.

Instead of just watching a bunch of video that may or may not be correct, here are a couple of excerpts for the service manual.

View attachment A1G2 Impeller Replace.pdf View attachment A1G2 R&R.pdf

 

[jtracc]

Re: Thermastat 3.0

Those pins aren't "Required" but they do make the job a bit easier. Just cut the heads off a couple of bolts about about 2 inches long and instant alignment pins. Keeps the gaskets and bottom plate from sliding around while you turn the shaft to push the housing down.

They are like that tool used to hold the shift slide in place. You can do the job without it too.

Instead of just watching a bunch of video that may or may not be correct, here are a couple of excerpts for the service manual.

View attachment 168995 View attachment 168996

Did you not read the post above that where i posted the link of the manual section that I used? Also my engine is not a early model so there is no need for the alignment screws. Like someone said any person with a little commen sense can line up a few gaskets.

 

[oldjeep]

Re: Thermastat 3.0

Did you not read the post above that where i posted the link of the manual section that I used? Also my engine is not a early model so there is no need for the alignment screws. Like someone said any person with a little commen sense can line up a few gaskets.

He's just trying to help - and you must have missed the part where he said that you can do without the pins