1986 Tohatsu M40C no water out of tell tale

[Sea Rider]

Re: 1986 Tohatsu M40C no water out of tell tale

Why don't you remove thermostat, place a hose that matches same thermo diameter and open faucett for a direct water blast inside crankcase, if that doesnt remove clog, another example of severe interal clog through the years....

Happy Boating

 

[pvanv]

Re: 1986 Tohatsu M40C no water out of tell tale

No scoring anywhere. Everything looks good as far as we can see. I am not experienced at all with working on outboards. This is my first. When I ordered the impeller, I tried to order a thermostat as well but the dealer told me it didn't have one. It appears to have a housing for one. is the dealer wrong?

Find a more competent dealer.

 

[AlleghenyAngler]

Re: 1986 Tohatsu M40C no water out of tell tale

I took the advice on this thread and used a wire tie to poke around the pisser on the back of the motor and dislodged whatever was blocking the water. Everything is fine now. This motor is a very strong runner. Couldn't be more pleased. Thanks to those who posted advice in this thread.

 

[KCKguy]

Re: 1986 Tohatsu M40C no water out of tell tale

I took the advice on this thread and used a wire tie to poke around the pisser on the back of the motor and dislodged whatever was blocking the water. Everything is fine now. This motor is a very strong runner. Couldn't be more pleased. Thanks to those who posted advice in this thread.

Wish mine was that easy. I took the lower end off ran a piece of wire up the water pipe, ran a piece through the tell tale, blew air through the water pipe and tell tale.

With the lower unit attached I ran a hose into the thermostat and water came out of the tell tale. I am guessing that means I don't have any obstruction through the heads. I can also run water through the upper flush port and water will come out of the tell tale.

With the lower unit off I ran a hose into thermostat and water came out of water pipe pretty freely.

I attached lower unit and ran water through some muffs with the thermostat off and I did not see any signs of water coming up with the engine running.

I am trying to isolate if its a blockage somewhere or if it's something with the water pump. I made sure that the water pipe was aligned correctly when I hookeup lower unit.

Do I need to put any type of sealant on the water pump guide plate?

Thanks,

Randy

 

[KCKguy]

Re: 1986 Tohatsu M40C no water out of tell tale

Wish mine was that easy. I took the lower end off ran a piece of wire up the water pipe, ran a piece through the tell tale, blew air through the water pipe and tell tale.

With the lower unit attached I ran a hose into the thermostat and water came out of the tell tale. I am guessing that means I don't have any obstruction through the heads. I can also run water through the upper flush port and water will come out of the tell tale.

With the lower unit off I ran a hose into thermostat and water came out of water pipe pretty freely.

I attached lower unit and ran water through some muffs with the thermostat off and I did not see any signs of water coming up with the engine running.

I am trying to isolate if its a blockage somewhere or if it's something with the water pump. I made sure that the water pipe was aligned correctly when I hookeup lower unit.

Do I need to put any type of sealant on the water pump guide plate?

Thanks,

Randy

I found another mechanic, he was pretty down to earth and suggested checking the impeller and making sure it is in correctly. Someone else mentioned turning the shaft clockwise but I didn't catch on to what they were wanting. So I will check and see if the impeller is installed correctly and let you know what happens.

 

[Sea Rider]

Re: 1986 Tohatsu M40C no water out of tell tale

No need to put any sealent on WP guide plate, are you 100% sure impeller is the right one for the M40C, have rotated shaft with keyed & seated impeller CW while pushing water housing down. If all, yes will need to exorcise that horse. Remember once having near like problem, the issue was a severe salt clog in drive shaft housing, removed complete engine from base and clog was spotted inside base water laybyrinth.

If that oldie were mine, would disarm cylinder head, exhaust cover & engine base, check, clean all water passages, install 4 new gaskets and torque all parts well, definitely the clog must be loceted in one of those areas.

If wanting to do new homework : Parts needed.

(1) M345010050 Cylinder Gasket
(1) M345023050 Exhaust Cover Gasket
(1) M345013030 Engine Base
(1) M345610120 Drive Shaft Housing Gasket

Paul might gladly help with parts prices.

Happy Boating

 

[Skidz]

Re: 1986 Tohatsu M40C no water out of tell tale

Sounds like the problem is with the impeller or lower housing. Quite a while back I was having similar trouble with a J/E outboard that I had replaced the impeller on. I just couldn't get any water out of the tell tale and was baffled as to where the problem might be. I wound up taking of the lower unit and submerged it nearly all the way in a large pail, standing upright. I took a stiff piece of rubber hose and clamped it to the drive shaft and put a large bolt in the other side of the hose, also clamped. Then I spun the bolt and driveshaft with an electric drill. I knew that if no water came out of the pipe, the problem was with the lower unit. Turns out that's exactly what it was; the stainless wp cup was worn out and not allowing the impeller to work right. At least if you try this you can tell if the wp is actually pumping, without having to run the engine and risk overheat. I don't see why it's not worth a try at the very least.

 

[Sea Rider]

Re: 1986 Tohatsu M40C no water out of tell tale

Skids, when you say worn out, what exactly was, cup diameter was excesively wider, walls were scored ? Depending on your boating area, sea, rever, ponds you could have less or more wp wear due to sand, abrasive substances, mud in suspension while pump is working.

Happy Boating

 

[KCKguy]

Re: 1986 Tohatsu M40C no water out of tell tale

No need to put any sealent on WP guide plate, are you 100% sure impeller is the right one for the M40C, have rotated shaft with keyed & seated impeller CW while pushing water housing down. If all, yes will need to exorcise that horse. Remember once having near like problem, the issue was a severe salt clog in drive shaft housing, removed complete engine from base and clog was spotted inside base water laybyrinth.

If that oldie were mine, would disarm cylinder head, exhaust cover & engine base, check, clean all water passages, install 4 new gaskets and torque all parts well, definitely the clog must be loceted in one of those areas.

If wanting to do new homework : Parts needed.

(1) M345010050 Cylinder Gasket
(1) M345023050 Exhaust Cover Gasket
(1) M345013030 Engine Base
(1) M345610120 Drive Shaft Housing Gasket

Paul might gladly help with parts prices.

Happy Boating

I will probably end up going this route or driving a hour to the mechanic I spoke to and having him work on it. I do have a qustion though. If there is a clog somewhere, would I still be able to get water out of the water pipe and the tell tale hole when I flush it? When i hook the hose up to flush it I get water out of both the tell tale hole and the water pipe when I have the lower unit off. I also get water out of both of those places when I run a hose through the thermostat.

I did talk to the ol boy who I got the engine from and he did say it got hot once, could that have anything to do with it? Although I am probably going towards this direction anyways, would a bad headgasket cause it to not pump water?

Randy

 

[Sea Rider]

Re: 1986 Tohatsu M40C no water out of tell tale

If having a real bad head gasket, probably won't mange to turn that engine on, if pump is in good working condition will still pump water upwards assuming head gasket is still fine & operative.

Two last wild guesses, crankcase has a interior round anode inside water path to prevent internal block corrosion, could have broken into pieces and clogged water passage, to check will need to remove exhaust cover and place & torque a new gasket. Also check upper water tube connection to lower crankcase for clogs, for that will need to disarm drive shaft housing, check if labyrinth water paths and connection are nonobstructed, if so, work your way upwards towards head, good luck on interior search.

Happy Boating

 

[Skidz]

Re: 1986 Tohatsu M40C no water out of tell tale

Skids, when you say worn out, what exactly was, cup diameter was excesively wider, walls were scored ? Depending on your boating area, sea, rever, ponds you could have less or more wp wear due to sand, abrasive substances, mud in suspension while pump is working.

Happy Boating

Luis, I had been trolling along a sandbar not long before this, and it looked as though some had gotten sucked in; the cup was scored badly, and it had also roughed up the edges of the impeller. Thankfully all it took was a pump kit to get me back on track.

 

[Sea Rider]

Re: 1986 Tohatsu M40C no water out of tell tale

Yes, for constant boating in sand areas you need to place a Chrome plate water pump kit, available at Tohatsu...

Happy Boating