The Eska Files

[mrcrabs]

Re: The Eska Files

I have finally got every piece including the 66 spilt needles for the crank pin fo my Ted Williams 7.5 Deluxe model 217-5949-0, I have all the lower unit seals I need and 3 diffrent SSI to choose from including the Stoller repaired unit& timing tools including the tecumseh depth gage, if the weather stays nice I may actually get busy and fix this thing, and when the economy pics up I will buy some batterys for my camera, ha!

Bump

 

[cprince]

Re: The Eska Files

Looking forward to the pictures MrCrabs!

TTT and things that go BUMP in the night.

Craig

 

[mrcrabs]

Re: The Eska Files

A well placed hickory nut, which stopped everything from throttle to gear shifter.
Darn mice are everywhere...

 

[Tommy Two Stroke]

Re: The Eska Files

MrCrabs, I just noticed you included my lower crank seal retrofit and engine timing procedure in your list of resources. Great to see this info on your list! I hope others may benefit from it.

 

[mrcrabs]

Re: The Eska Files

Yes I did Tommy, a long time ago.

I wanted to ask you about your engine model no. because your fix will not work on all models, my deluxe 640-04a has a very small all rubber lower seal.

I just finished a complete rebuild of my deluxe and I followed my Tecumseh manual to the letter and used the dial indicator, she was dead on when I set the cam and really theres not much to it, the one thing I learned is where to turn up the power on the little Tecumseh...only tool you need is a small hammer and punch:facepalm: I bumped mine up from .118 BTDC to the newer model setting of .115 or It may even be at .112, just remember that the newer models used a aluminum rod and a offset pistion for more power and to cushion the crank pin, were as the older model AV817's used a steel rod and a straight on piston....I found a brand new NLA 817 piston and I used the INA 148 caged needle bearing for the top end crank bearing...$4 vs $20 and if anybody is looking to replace there top end crank bearing the proper replacement bearing is the koyo 148 full complament style of bearing and not the INA 148, INA 148's were used as Harley cam bearings and are caged, use at your own risk.

 

[Tommy Two Stroke]

Re: The Eska Files

Would you also mind adding my posting about the OMC ignition coil retrofit to your ESKA Files list? This might be useful to some people.

I don't have my 7.5hp Eska here with me, I will check tonight and see what the Tecumseh model number is. I am doing a partial rebuild on my 3hp Eska right now, and I just changed the lower crank seal...this one has an all-rubber seal held in by an aluminum backing plate and a spring clip. Maybe this is the same type of seal that you are working on now? The splined end of the crankshaft on this engine is fat compared to the 7.5hp, so it wasn't easy to get the spring clip out to change the seal. Sears still sells these particular seals, and mine arrived in a genuine Tecumseh package.

I believe my piston is standard. How does an offset piston increase power? I am not famiiliar with this technique. Good to know you found a standard top end crank bearing. Mine wasn't bad on the 7.5hp, so I just put the needles back in with grease and it seems to work fine.

As always, thx for the good research you're doing on these engines.

 

[Tommy Two Stroke]

Re: The Eska Files

mrcrabs, to answer your question:

my 7.5hp Eska that I did the speedi-sleeve retrofit on, is Tecumseh model # 640-18

my 3.0hp Eska with the small all rubber lower seal, is Tecumseh model # 642-16A

 

[mrcrabs]

Re: The Eska Files

What I found out was that at model 640-07 tecumseh changed from the steel rod w/66 split needles to the aluminum rod w/33 needles and changed the OD of the seal using a rubber clad metal seal istead of the all rubber seal. I suspect the seal bore was changed again in the 640 poduction but I have no proof except for differing part no.'s at sears. Sears did not have the seal for my engine so I bought one from a source I will not name at the coat of $8 later I discovered that certifiedpartscorp.com had them for $3...heres a real trick, try and find a piston and pin for a AV 817...or those 66 split needles:facepalm:

 

[Tommy Two Stroke]

Re: The Eska Files

My 7.5 has an aluminum connecting rod with 33 needles on the big end bearing. It doesn't have an offset piston.

I haven't had my 3.0 apart far enough to tell what kind of connecting rod it has - this engine is in good shape so I'm not planning to split the crankcase (gasket for that is no longer available so I'd have to make my own) or take the reed assembly out, so I haven't seen the con rod.

It's surprising to me how different the lower crankshaft seals are on these two engines.

 

[mrcrabs]

Re: The Eska Files

It's surprising to me how different the lower crankshaft seals are on these two engines.

yep, and the bearing is a bear to get out do to the smaller hole in the casting,

My 7.5 has an aluminum connecting rod with 33 needles on the big end bearing. It doesn't have an offset piston.

are you sure? did your piston have a V stamped on your piston? all V stamped pistons denote the offset and its correct cylinder position.
I understand from my buddies with the big boats such as the big block chevy Baja's that Chevy V8's have offset piston...the purpose supposedly is to cushion the force of the piston against the cylinder, They mentioned that an old chevy hot rod trick was to reverse the offset for a short lived power gain??? Of such I know not....

 

[Tommy Two Stroke]

Re: The Eska Files

I did not see a V anywhere on the piston. The piston looked very symmetrical when I checked it out during the rebuild, so I would be surprised if it has any offset.

 

[sasquatchfound]

Re: The Eska Files

I have a 5hp eska Pathfinder I am going to rebuild. I don't know how similar al the eska motors are, but any help from the more knowledgble folks on here would be great.




Thanks

 

[mrcrabs]

Re: The Eska Files

whats the model number of your pathfinder?
If your going to try and do a complete rebuild get ready for a big suprise....availability for replacement parts for the power head will be 0 to none, best bet is a used replacment engine. You may even be able to find a new shortblock that will mount up.

 

[sasquatchfound]

Re: The Eska Files

I found a powerhead and a complete parts motor on ebay. the complete motor is going for $135. Is that to much for a parts motor? I will post model/serial #'s fri.



Thanks

 

[MahtyMaht]

Re: The Eska Files

I got the ugly feelin' that not nearly enough Sears/Eska/Craftsman people are lookin' at this thang before they run off half cocked startin' threads. Maybe it's just all part of bein' a man - I know the last things i want to do is read the directions, look at the map, and worst of all - ask for directions. Just don't want to lose the man points.

 

[mrcrabs]

Re: The Eska Files

I gave 14$ for a really nice and tight 7hp AV750 engine off of ebay a few months ago.
I see people asking the big bucks once in while for old powerheads but $135 is wayyyyyy to much...unless it never been run before NOS still in the box and you want it really bad!!!

 

[sasquatchfound]

Re: The Eska Files

thanks for all the help. My plan was to use the motor as a kicker for my boat. I did learn that tecumseh made the powerheads for them. I will not be buying the one one ebay.

 

[mrcrabs]

Re: The Eska Files

I have added a carb rebuild primer to the Eska files,

 

[Tony Joe]

Re: The Eska Files

Now that we have it scattered on the kitchen table we need to order a kit, they are widely available from from a number of sources but I won't go in to promotions today.

Would you consider helping a newby here and do a little promoting here? LOL I've been searching for a source for a rebuild kit for the carb on a 7.5 HP 1985 or 1986 Gamefisher. I haven't been able to locate a kit so any help you can furnish would be greatly.

Thanks in advance.
Tony Hoffman

 

[mrcrabs]

Re: The Eska Files

We really need your model number first, then if its Eska built you can call www.certifiedpartscorp.com for a good deal on parts , yep they have a web site but you will need to call them to order, and you need to know your parts numbers but they will help if you know your model number. you can use sears parts lookup or send PM after you post your model number and I will help you with parts diagrams. Also there is Eskaman2008 on ebay or you can contact him through our Eska yahoo group if you join.