110 hp evinrude thermostat question

[dsujen]

I have a 1986 110 hp 4cyl. evinrude vro. model#e11omlcdc. Serial# r1308421. I bought this off a friend of mine who took the thermostats out because it wasn't pumping water. The thermostats were in pretty bad shape. I got it running and it pumps water good without the thermostats in. My winter project is making this motor reliable and ready to go for the spring. I am putting on a new non vro fuel pump, water pump, and thermostats. The guy said I can run it without the thermostats, but I fear on the cool nj mornings that this might foul the spark plugs on the cold 2 stroke engine. I noticed in the service manual that it suggests changing the thermostats when the power head is removed. I can't believe you have to remove the power head to change thermostats. But as I could remove the empty therm. housing. I am having a real hard time trying to install the housing with the therm. parts in it. My question is: Do I have to remove the power head to do this thermostat replacement? If no, how do I go about it. Also I could use some tips on doing a water pump assembly replacement on this motor because I never did it before.

 

[mikeyzx2]

Re: 110 hp evinrude thermostat question

Nope, you don't have to remove the motor to change thermostats. Just the cover. DO NOT run it without the 'stats, it'll do more than foul plugs. It'll foul up the pistons and bores. Someone on here will fill you in on that hopefully, I don't have that topic bookmarked. <br /><br />Best advice: get the OEM manual for that model. www.kencook.com or www.marineengine.com are good places to start.

 

[DJ]

Re: 110 hp evinrude thermostat question

sujend,<br /><br />DO NOT run it without the t-stat's. You can change them without removing the powerhead. It's not fun, but it can be done.<br /><br />Here's a hint. Remove the bolts from the lower cowl pan and pull down the back of it.<br /><br />If you are having water flow problems, I suggest you remove the heads (easy) and replace the deflectors. The deflectors are in the water passages just under each head. They are rubber and tend to shift if the engine getss overheated.<br /><br />Don't forget to service the water pump.

 

[dsujen]

Re: 110 hp evinrude thermostat question

I already removed the back vertical lower cover. The big cover that the engine cover mounts to is in the way. I already have the manual. I bought it from marine engine.com. It doesn't tell you how to remove it, but it shows it being removed with the lower engine cover and power head removed. It also says "Note: The thermostats and the pressure valves should be serviced when the power head is removed from the adapter." Im going to try to see if I can get that big lower cover to move down a little. Another question. Can I use permatex gasket sealing compound instead of the omc stuff on my thermostat and water pump gaskets? My local marine store doesn't sell engine stuff. Also, I was reading in my manual about the water pump procedure. It tells me to use omc adhesive m in the seal ring groove. What can I use as an equivalent to that so I don't have to drive an hour to the good marine supply store?

 

[OBJ]

Re: 110 hp evinrude thermostat question

Take a look at the thread on the link below. Same problem as yours. Some advice there too and ways to get at the t-stats.<br /><br /> http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=038731

 

[dsujen]

Re: 110 hp evinrude thermostat question

I'm going to cut a rectangular piece out of the lower pan and then mig weld it back. I've tried to lower the pan, but it didn't help. I had no problem getting all of the bolts out and the thermostat hosing and spacer out because there was nothing inside. When I tried to re install with the guts inside I realized it would be impossible. I don't want to remove the powerhead because i feel like i'm going to open up a can of worms. Plus I would have to make something to lift the motor off with my chain hoist. It's easier just to cut and patch I think. I can't believe this motor was designed this way.

 

[OBJ]

Re: 110 hp evinrude thermostat question

If you can mig, just make a door you can put back in place and open again if you need to get back in there. If you drop the lower shroud, just under the pan, it may help a little.

 

[Solittle]

Re: 110 hp evinrude thermostat question

14 - Go to the link posted by OBJ above. I did it to my 87 110s without removing the powerhead or dropping the pan. You remove the rear cover below the pan and access from below for the outside 2 bolts.<br /><br />For the reassembly position all the parts in the t-stat cover and hold them in place with a couple of rubber bands. Place this assembly where it goes and start all 3 bolts and screw them in a bit. Then snip the rubber bands and tighten - - walla - - you're done..

 

[dsujen]

Re: 110 hp evinrude thermostat question

Thankyou all for the info, but I cut a big chunk out of the lower engine cover. I used a jig saw and a cut off wheel air tool to cut it. I'm going to tack it back on with my mig welder and mabey use a bondo type filler to seal in the rest. This way I can remove it again if I have to with less effort. I had a hard time getting it together even with the crater I made. Especially because of the springs. No wonder boat mechanics always look pissed off. I figured I'd start with the thermostats cause I thought it would be easy and then work my way to the water pump. I hope the water pump's a little easier. What do I have to cut to get that out? What do I use as a replacement for omc adhesive m for in the water pump?

 

[emdsapmgr]

Re: 110 hp evinrude thermostat question

When you have the thermostat housing apart, look at the valve body. This is the middle plastic piece. There are two extremely small holes. Be sure they are clear/open or you will overheat at idle. Each feeds water to the thermostats at idle.

 

[dsujen]

Re: 110 hp evinrude thermostat question

One more question: The hoses that connect the thermostat housing to the water jacket are kinking when I put on new ones. Is there a special type of hose to use so that they don't kink and reduce flow? I used regular automotive heater hose. I also tried left over 5/8 boat fuel vent hose, but that kinked also.

 

[OBJ]

Re: 110 hp evinrude thermostat question

You need to use molded hose. It's made with a bend in it so it won't kink. The BRP PN's are 340975 and 340976. The different PN's are because one hose is longer than the other. I'm not sure if you could pick these up from Sierra (thru a NAPA dealer) or not. I took a look through iboats Mall and couldn't find them. <br /><br />But they do need to be the molded hose.

 

[ledgefinder]

Re: 110 hp evinrude thermostat question

Thermostats on the bubblebacks are brutal. There's a SnapOn 7/16 combination wrench that just happens to fit from underneath.<br /><br />Best practice is to run thermostats. HOWEVER not unusual at all for them to be missing from older V4s, here in the northeast. Further, Mercs didn't have thermostats until the 1980s. (In fact Merc ads claimed a feature of their reed-valve-in-crank design was that it avoided the need for a thermostat.) Unless you troll with the V4, I wouldn't recommend you go through the trouble of removing the powerhead from a salty old motor, just to put thermostats in. You won't kill it running it without them.

 

[ledgefinder]

Re: 110 hp evinrude thermostat question

SnapOn OSH14

 

[reeldutch]

Re: 110 hp evinrude thermostat question

i cant believe people recommend running an old v4 without tstats.<br /><br />shure it can be a pain in the a.. but there are solutions that make it a lot easyer.<br />and to tell people that you wont kill the motor without tstats sounds realy good.<br />i like to hear the theorie behind that.<br />please explain why its ok to run them without.<br />either its ok or its not.

 

[dsujen]

Re: 110 hp evinrude thermostat question

obj, Where did you find these part numbers? And what does BRP mean?

 

[OBJ]

Re: 110 hp evinrude thermostat question

I found the part numbers on the parts list for your engine. The part numbers I posted are the new numbers.....the original PN's were superceded to these new ones.<br /><br />BRP means Bombardier Recreational Products.....I should have said John/Rude dealer.....sorry 'bout that.<br /><br />Check the link below and click on engine diagrams. It's a link to the BRP site and you can see the parts breakdown of your engine. Just follow the prompts.<br /><br /> http://www.evinrude.com/en-US/ <br /><br /><br />It's not "OK" to run with out the t-stats. If it was, they wouldn't be there.