1977 Evinrude 55HP Missing Gasket in Schematics?

[DamianJP]

Hey guys

I had a problem with the motor pissing steam. So I re did the water pump and L/U exhaust seals. And it still is getting steam out of the tell-tale.

Im thinking its the 'head gasket' area seal(s).

Im building up a small list of stuff to re seal this area when I came across Part #63 is missing everywhere I look online in the schematics.

Can anyone tell me why part #63 is missing and where I can order it?

Also if it's not too much trouble, what other than this head gasket leaking can give steam out of the tell-tale?


Thanks,
DamianJP

 

[Lion hunter]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

Doesn't sound like you getting enough water to cool the motor. Whether it's leaking out through a seal, not getting by the thermostat or the pump is not pulling enough in it's hard to say. I would think that if it was a head gasket you would see the water going somewhere.

 

[DamianJP]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

I just did the water pump so I know the seals are good down there. I know there another one at the top of the mid section right underneath the power head, a seal that is for the water tube.

So i figured while I'm there just do easy preventive mantainace stuff. Could be the Thermo, it was hard to get at with the bottom cowling part in the way.

Ill check for steam-cleaned plugs to confirm a head gasket.


Whats your take on that gasket in the schematic for the exhaust housing? Part number 63, cant find it on any evinrude schematics I find. BRP, Crowley , and others.


Thanks,
DamianJP

 

[jonesg]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

I Ill check for steam-cleaned plugs to confirm a head gasket.



Thanks,
DamianJP

Compression test. Might be old water diverters under the head in the block too.

 

[Lion hunter]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

http://shop2.evinrude.com/Index.aspx?s1=n40vlspon56e1gq0omust7lg24&catalog_id=0&siteid=1

Got me stumped as to why it is not there in 1977. If you look at 1976 and 1978 it is listed and has the same part#. I would guess that 1977 would be the same as well. I may be wrong but I would think that that missing gasket may cause an exhaust leak above the water line, which may increase noise or allow water to escape. But it wouldn't prevent water from circulating and exiting the tell tale. I'm leaning toward a bad thermostat or maybe a water pump not pulling enough water. Are you doing this in a lake or barrel?

 

[DargelJohn]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

Check out this link. I see the #63 gasket. If this gasket were bad then you would have a leak on the outside of the engine. I would first try retroquing the powerhead base bolts and nuts.

http://www.boats.net/parts/search/BRP/EVINRUDE/1977/55773D 1977/EXHAUST HOUSING/parts.html

Is the motor overheating? Do you see a normal amount of water coming out of the prop hub and other places? You may just have some trash stuck in your tell tail fitting. Try clearing it with a piece of weed trimmer line. I had an Evinrude 60, the tell tail stopped working and the problem turned out to be trash in the fitting at the engine block.

 

[DamianJP]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

Thanks Lion Hunter , JonesSG , DargelJohn

LH-
Ill check the thermo, and I think the pump is good. I re did the pump and replace everything I could. It was doing it in both in the water / muffs.

Jones-
Ill rock the comp. test out too. Also are theese diverters fixable?

Dargel-
Dunno if it's over heating. Ill do more tests again. Would a clogged tell tale make the steam come from the tell tale too? Did you have to pull the power head to clear that block in the fitting at the block?


When this happened I went ahead and threw in a water pump / carbs / fuel pump. But didn't do the thermo cause it was at a tight spot on the block with the bottom part of the cowling blocking most of it. Ill try and get some time to recreate the symptoms and start to troubleshoot it.

I know it's of topic but how reliable are the late 70's evinrudes given proper maintance?


Thanks again guys !!!,
DamianJP

 

[DamianJP]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

Is the 1976 or the 1978 Gakset (Part 63 in Exhaust Housing Schematics) a exact fit in my 1977 55HP??

Thanks,
DamianJP

 

[Lion hunter]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

Is the 1976 or the 1978 Gakset (Part 63 in Exhaust Housing Schematics) a exact fit in my 1977 55HP??

Thanks,
DamianJP

Don't know for sure but the 1976 and 1978 gasket both have the same part#. If I was a betting man I'd say it was probably the same.

 

[DamianJP]

Re: 1977 Evinrude 55HP Missing Gasket in Schematics?

Cool Thanks Lion Hunter !!! For all the help help man, its all priceless to me.

And JonesSG / Dargel John!!

Well I went and did some troubleshooting and think Iv'e found the cause of the steam.

I took a compression test and top cylinder was 60+ and bottom cylinder was 120+ more towards 130 believe it or not. So I was very unhappy at first, I thought the cylinder was toast because I thought the head gasket make em' both low. So I said screw it let me dig in and check the cylinder walls / piston out. I have to get in there anyways if the crap hit the fan. So went I got in there I noticed the cylinder head/waterjacket gasket was breached in the middle of the two cylinders, and the metal ring part that seals the combustion chamber from the water jacket area was blown out letting the combustion chamber on cylinder one blown into the water jacket area!! Top piston was steam cleaned, while bottom was nice and uniform. The damn exhaust wasn't going out were it needed to be and forcing the water down and shooting steam/some water out the tell-tale.

So I think iv'e found my problem, what do you guys think? No power head pulling for me so far? (knock on wood). Both cylinder walls were very smooth and had no marks what so ever.

I know Im getting ahead of the 'game' sort to speak but I need to ask yet another 2 but important questions on top of your opinion if Iv'e found my problem.

1)How can I hook up a Temp gauge/ Which one to buy?

2) How can I hook up a water PSI gauge / Which to buy?

I am real happy right now and hopefully you guys concur that this is in fact the cause of this problem.

PIC UPDATE!!

Thanks again guys,
DamianJP