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Author Topic: Powerhead ID  (Read 1294 times)

August 20, 2012, 12:39:50 AM
Reply #15

Aquaholic12

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Re: Powerhead ID
« Reply #15 on: August 20, 2012, 12:39:50 AM »
There should be a freeze plug somewhere on it that will look like this.
The first letter will be j or even for Johnson or evinrude. The next is h.p.
This is j115.  Johnson 115. Sometimes they are hard to find or not there at all.


August 20, 2012, 05:26:24 AM
Reply #16

RickK

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Re: Powerhead ID
« Reply #16 on: August 20, 2012, 05:26:24 AM »
How many plugs are there on the 60 degree 4 cyl?  I found 2 on the starboard side and the upper one had the number I showed in the initial post, stamped on it.  Doesn't look like the one you show though.  :(  
I looked on the port side and didn't see any plugs readily in view.
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

August 20, 2012, 06:55:45 PM
Reply #17

RickK

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Re: Powerhead ID
« Reply #17 on: August 20, 2012, 06:55:45 PM »
I called OMC CS today and the number I had meant nothing to them. So I guess the number is a rebuilder's stamp.
He told me to look for a flat ground down spot on the block and see if it is stamped there by the rebuilder.  So that's my next quest.

I did ask the guy, "AL", what the difference was - ports and jets wise - between the 90 and 115.  He said "very little"  :scratch:   I kept clarifying and he kept saying "very little".  Maybe it's one of those sticker things that Aquasport is famous for?
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

August 20, 2012, 07:04:31 PM
Reply #18

saltfly

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Re: Powerhead ID
« Reply #18 on: August 20, 2012, 07:04:31 PM »
He should be able to tell you the size.  My book calls for, low speed on the 60 degree v to be  a, #27 and high speed is a #58D for the 90 hp. For the 115 its #20 for the low speed and #69D for the high speed. Those can be checked with the same number drill size.

August 20, 2012, 07:23:01 PM
Reply #19

RickK

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Re: Powerhead ID
« Reply #19 on: August 20, 2012, 07:23:01 PM »
I have seen drill indexes that had numbers instead of sizes - is that what they're used for?
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

August 21, 2012, 09:59:21 AM
Reply #20

saltfly

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Re: Powerhead ID
« Reply #20 on: August 21, 2012, 09:59:21 AM »
There are different reasons for drills being mark. Standard drills like 1/16, 1/8 and so on. Have a set tolerance.  But numbered and letter sizes from what I read many many years ago. Are made with tighter tolerances. That is just a basic answer. But Jets are drilled to numbered sizes. So they give there size by the drill size used to make the jet. I keep all of those sizes around, so I can clean out the jets, when cleaning the carb. That is if I can’t get the jet out to replace it. I also use them to increase the jet size. If I rebuild the motor. Increasing the bore some times requires a larger jet. You can look in the Machinist Hand Book for a more definitive answer. also on drill sizes, their are matric as well as British standard sizes. To many to keep track of.

August 21, 2012, 11:03:07 AM
Reply #21

wingtime

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Re: Powerhead ID
« Reply #21 on: August 21, 2012, 11:03:07 AM »
In aviation all the drills you use are numbered sizes not fractional.  Fractional sizes only increase in size by 1/64" increments, while number and letter size bits increase in size by much smaller increments especially in the smaller sizes (larger numbers).  Also number size bits allow for the proper clearance and tolerance of the holes for rivets, screws etc.  For example if I want to install a number 4 rivet (1/8") I would use a #30 bit.  For a number 3 rivet (3/32") I would use a #40 bit.  To give you and idea of how close the tolerances are between numbered sizes here's a link to a chart:  http://www.carbidedepot.com/formulas-drillsize.htm
1998 Explorer w/ Etec 250


1987 170 w/ Evinrude 90

August 21, 2012, 11:49:05 AM
Reply #22

saltfly

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Re: Powerhead ID
« Reply #22 on: August 21, 2012, 11:49:05 AM »
I  guess it depended on which aviation company you worked for. We used all sizes from factional, number, metric and letter sizes. It just depended on the size hole needed and the tolerance being applied. :thumright:

August 21, 2012, 12:03:33 PM
Reply #23

wingtime

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Re: Powerhead ID
« Reply #23 on: August 21, 2012, 12:03:33 PM »
yeah I kind of thought of that... I should have said I generally used them  LOL  I was talking about general aviation.  Metric is creeping in more and more now.
1998 Explorer w/ Etec 250


1987 170 w/ Evinrude 90

August 21, 2012, 12:54:02 PM
Reply #24

saltfly

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Re: Powerhead ID
« Reply #24 on: August 21, 2012, 12:54:02 PM »
Yea wing, its getting to the point. Its almost impossible to work on your car, with out having every factional and metric wrench out their. I even found fractional size bolts on my Yamaha. At first I thought somebody really screwed up. I thought that I had a bolt with a factional head and a metric thread. But no it was all American standard thread. Come to find out. The part being used was made in the good old US of A. And was only built at that time with factional hardware. Now the same part can be found with both. Crazy. Makes it hard on us shad tree guys. I put a temp. gauge on my Yamaha. The sensor has American standard threads with factional hex. The adapter needed. Has American standard inturnal threads for the sensor and metric exturnal threads to install it in the power head. So I couldn't just go buy an adapter at the local fitting supply store For $5. Had to buy a $35 adapter, because of the difference in threads. :mrgreen:

August 21, 2012, 01:56:29 PM
Reply #25

seabob4

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Re: Powerhead ID
« Reply #25 on: August 21, 2012, 01:56:29 PM »
My drill index when I was working for Lockheed-Martin...



Corner of 520 and A1A...

August 21, 2012, 03:14:39 PM
Reply #26

saltfly

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Re: Powerhead ID
« Reply #26 on: August 21, 2012, 03:14:39 PM »
Bob I got one just like it. Except, mine is gray and Half empty. I brake more bits then I can keep up with replacing. bwahahaha :mrgreen:

August 21, 2012, 06:02:47 PM
Reply #27

RickK

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Re: Powerhead ID
« Reply #27 on: August 21, 2012, 06:02:47 PM »
As I get into the rebuild I may have to run to HF for a set.  :D
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

August 21, 2012, 06:24:52 PM
Reply #28

saltfly

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Re: Powerhead ID
« Reply #28 on: August 21, 2012, 06:24:52 PM »
I just looked at that chart that wing put a web page to. That’s a good chart to copy and keep in your repair manual.  (I keep a pack of card stock for printing that type of info. It hold up longer then paper.) I keep one their as well as in my tool box, tape to the inside of the top.. The one in my tool box, also gives you the pilot and tap drill sizes for each thread size. All is good info for anyone doing their own work. They make life easier. You don’t have to run all over the place trying to find info that would be right at your finger tips, when needed. Also Rick get yourself a small tap set. When I rebuild a motor. I run the tap by hand into all the threaded holes, to clean them out. Make life easier when you torque the bolts, during reassembly. I also have a wire wheel on one side of my grinder, to clean the bolts. Also don’t try to be a superman and hold the bolts in your hands. Use vise grips or a good pair of channel locks. :thumleft:

ps: I hope you don’t mind the tips. I learned most of them the hard way. :shock:

August 21, 2012, 07:47:53 PM
Reply #29

RickK

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Re: Powerhead ID
« Reply #29 on: August 21, 2012, 07:47:53 PM »
Don't mind at all - keep 'em coming  :salut:
Honestly, at this point in time I don't even know where to use those special drills  :shock:  All that will change as I get into the rebuild. Never too old to learn - keep the brain working, don't cha know :thumright:

Answers below - don't cheat....
Quote
KEEP THE GRAY MATTER ACTIVE

1. Johnny's mother had three children The first child was named April. The second child was named May. What was the third child's name?

2. There is a clerk at the butcher shop, he is five feet ten inches tall and he wears size 13 sneakers. What does he weigh?

3. Before Mt. Everest was discovered, what was the highest mountain in the world?

4. How much dirt is there in a hole that measures two feet by three feet by four feet?

5. What word in the English Language is always spelled incorrectly?

6. Billy was born on December 28th, yet his birthday is always in the summer. How is this possible?

7. In California , you cannot take a picture of a man with a wooden leg. Why not?

8. What was the President's Name in 1975?

9. If you were running a race, and you passed the person in 2nd place, what place would you be in now?

10. Which is correct to say, "The yolk of the egg are white" or "The yolk of the egg is white"?

11. If a farmer has 5 haystacks in one field and 4 haystacks in the other field, how many haystacks would he have if he combined them all in another field?

 




 

 

 

 






Here are the Answers:

1. Johnny's mother had three children. The first child was named April. The second child was named May What was the third child's name?

Answer: Johnny of course

2. There is a clerk at the butcher shop, he is five feet ten inches tall, and he wears size 13 sneakers. What does he weigh?

Answer: Meat.

3. Before Mt. Everest was discovered, what was the highest mountain in the world?

Answer: Mt. Everest ; it just wasn't discovered yet. [You're not very good at this are you?]

4. How much dirt is there in a hole that measures two feet by three feet by four feet?

Answer: There is no dirt in a hole.

5. What word in the English Language is always spelled incorrectly?

Answer: Incorrectly

6. Billy was born on December 28th, yet her birthday is always in the summer. How is this possible?

Answer: Billy lives in the Southern Hemisphere

7. In California , you cannot take a picture of a man with a wooden leg. Why not?

Answer: You can't take pictures with a wooden leg. You need a camera to take pictures.

8. What was the President's Name in 1975?

Answer: Same as is it now - Barack Obama  [Oh, come on .....]

9. If you were running a race, and you passed the person in 2nd place, what place would you be in now?

Answer: You would be in 2nd.. Well, you passed the person in second place, not first.

10. Which is correct to say, "The yolk of the egg are white" or "The yolk of the egg is white"?

Answer: Neither, the yolk of the egg is yellow  [Duh]

11. If a farmer has 5 haystacks in one field and 4 haystacks in the other field, how many haystacks would he have if he combined them all in another field?

Answer: One. If he combines all of his haystacks, they all become one big stack.
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

 


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