is this a thermostat problem
 

hi all,

I purchased my first boat with a '84 90 hp evinrude(V4) sometime
ago. I found it seems to run hot. When I run it in neutral with the
earmuff for a few minutes, I couldn't place my finger on the cylinder
flat area for any longer than 1 or 2 sec. there's constant stream
from the pee hole but there's also cool water coming out of the small
housing betwn the lower unit and the leg, there's no water coming out
of the exhaust holes(should there be?) Does this mean the thermostat
is stuck closed?

I'll take cylinder temp. once I buy the infare gun (saw the ad. for a
pocket size one for $10 at harbor freights, are these any good? )

Did a compression test, the readings were 125, 120 on bank 1 and 110,
110 on bank 2. any thoughts on this?

thanks

s o

is this a thermostat problem
 

The HF unit is great.
JR

s o wrote:
hi all,

I purchased my first boat with a '84 90 hp evinrude(V4) sometime
ago. I found it seems to run hot. When I run it in neutral with the
earmuff for a few minutes, I couldn't place my finger on the cylinder
flat area for any longer than 1 or 2 sec. there's constant stream
from the pee hole but there's also cool water coming out of the small
housing betwn the lower unit and the leg, there's no water coming out
of the exhaust holes(should there be?) Does this mean the thermostat
is stuck closed?

I'll take cylinder temp. once I buy the infare gun (saw the ad. for a
pocket size one for $10 at harbor freights, are these any good? )

Did a compression test, the readings were 125, 120 on bank 1 and 110,
110 on bank 2. any thoughts on this?

thanks

s o



--
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Home Page: http://www.seanet.com/~jasonrnorth

is this a thermostat problem
 

Have you EVER changed the thermostats??? If not it might be waayy
overdue.
The engine does should be around the 130 degree range. Maybe a bit
higher or lower depending on the make and existing water temp.

Another thing to look at is the waterpump impeller. That should be
changed every two seasons or so depending on how much you use
your boat.

Tom


On Mar 19, 1:13 pm, "s o" wrote:
hi all,

I purchased my first boat with a '84 90 hp evinrude(V4) sometime
ago. I found it seems to run hot. When I run it in neutral with the
earmuff for a few minutes, I couldn't place my finger on the cylinder
flat area for any longer than 1 or 2 sec. there's constant stream
from the pee hole but there's also cool water coming out of the small
housing betwn the lower unit and the leg, there's no water coming out
of the exhaust holes(should there be?) Does this mean the thermostat
is stuck closed?

I'll take cylinder temp. once I buy the infare gun (saw the ad. for a
pocket size one for $10 at harbor freights, are these any good? )

Did a compression test, the readings were 125, 120 on bank 1 and 110,
110 on bank 2. any thoughts on this?

thanks

s o

is this a thermostat problem
 

On Mar 19, 11:01 am, wrote:
Have you EVER changed the thermostats??? If not it might be waayy
overdue.
The engine does should be around the 130 degree range. Maybe a bit
higher or lower depending on the make and existing water temp.

Another thing to look at is the waterpump impeller. That should be
changed every two seasons or so depending on how much you use
your boat.

Tom

On Mar 19, 1:13 pm, "s o" wrote:

hi all,

I purchased my first boat with a '84 90 hp evinrude(V4) sometime
ago. I found it seems to run hot. When I run it in neutral with the
earmuff for a few minutes, I couldn't place my finger on the cylinder
flat area for any longer than 1 or 2 sec. there's constant stream
from the pee hole but there's also cool water coming out of the small
housing betwn the lower unit and the leg, there's no water coming out
of the exhaust holes(should there be?) Does this mean the thermostat
is stuck closed?

I'll take cylinder temp. once I buy the infare gun (saw the ad. for a
pocket size one for $10 at harbor freights, are these any good? )

Did a compression test, the readings were 125, 120 on bank 1 and 110,
110 on bank 2. any thoughts on this?

thanks

s o

the service manual shows the stat is housed inside the exhaust but the
space betwn the engine housing and the exhaust is way too small to get
any kind of wrench in there? what's the trick here? The bolts are
rusted (and frozen, I bet.)
Are stats always a pain to get at?

is this a thermostat problem
 

"s o" wrote:
Are stats always a pain to get at?

Not usually. Pretty simple mostly.
Most people around here pull 'em out and throw 'em away. In your
case, it wouldn't hurt to run without it long enough to see if that
solves the o'heat problem. If it does, you can replace it if you want
to.

Rick

is this a thermostat problem
 

On Mar 19, 11:32 am, wrote:
"s o" wrote:
Are stats always a pain to get at?

Not usually. Pretty simple mostly.
Most people around here pull 'em out and throw 'em away. In your
case, it wouldn't hurt to run without it long enough to see if that
solves the o'heat problem. If it does, you can replace it if you want
to.

Rick


bank 1 shows a bit of discoloration already(I think that's what it's.)
The entire cylinder head's color is a little different(a little
duller, I guess) from the block. Is this the beginning of the end for
an engine? I read that discoloration is very bad.

thanks

s o

is this a thermostat problem
 

"s o" wrote:
cylinder head's color is a little different(a little
duller, I guess) from the block. Is this the beginning of the end for
an engine?

I don't know but I wouldn't allow it to get extremely hot again. Pull
the thermostat and see if that helps. If it looks like it's gonna
overheat again, replace the impeller (or you might just go ahead and
do that now as well).

Rick