115 evinrude

[splitshot]

Tearing down a 1981 115 Evinrude planning a complete rebuild i have 2 questions one about a head and the second about a broke piece below the exhaust plate..

So first the head the motor broke a ring and it bouced around and knicked the head a few times this is not on the gasket surface for the head gasket but inside of it can i reuse it ?? if no, why not

Second this piece was broke when my brother was trying to help me get the powerhead off he used a pry bar at the back (i was working the front) i know i know never turn you back but is there a way that i can build this area up so i can make it seal to the base gasket ??

thanks for your help

 

[emdsapmgr]

Re: 115 evinrude

The attached picture is shows the area that has broken on the base of the engine. This will be a difficult repair. You need to take it to a machine shop. They will have to weld in a new (replacement) rib. Then machine it flat with the block bottom and then machine it flat with the exhaust back. They will then have to drill and tap the hole for the long bolt. During the repair, you may need to retap a couple of the exhaust bolt holes on that same rib. You may find other exhaust bolts will break off during disassembly. They will have to be drilled and tapped out. With all the expense, you may want to locate a replacement block. Some folks grind the pitting on the head and reuse it. Personally, I would not reuse the head. The raised edge of each little pit can cause a hot spot when the engine gets up to operating temps, which can cause detonation. A factory rep would say to pitch it in the garbage. Those are the low compression heads for 81. You can find replacement heads from a 140 from that year an improve the performance.

 

[splitshot]

Re: 115 evinrude

souns like alot of money either way couldn't i build up the area with epoxy or jb weld so it will seal around the base gasket and just leave the one mounting bolt out it will have 11 others holding it on...

 

[James R]

Re: 115 evinrude

I go with EMD... You need solid metal under there. There are no gas stations or repair shops you can pull in to out there on the pond. These motors are high performance precision pieces of machinery. Have it reworked professionally or find a replacement block.

 

[Chinewalker]

Re: 115 evinrude

That area is in direct contact with exhaust heat and will be gone in short order if you try to goop it up with JB Weld or the like. Do it right or find another block...
- Scott

 

[Benny1963]

Re: 115 evinrude

a block is cheap compared to destroying new parts the block and heads are fairly cheap .look on ebay ya may find a good powerhead ,
i found a 175 with 100 psi across for 400 ,ran all last summer had 600 in powerhead repair,built me another powerhead ,while i used it .then changed them out, built the other one a month ago and found good mid and lower
with bad powerhead, now i have two 175s good luck

 

[splitshot]

Re: 115 evinrude

I'm trying to find somebody to weld it up...what are these blocks made out off isnt it cast aluminum ??