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What should I look for? Badly overheated Johnson 35.
surfshark	#1  Posted on 05/19/11 - 5:40 PM
Member Posts: 28 Comments: 0 Joined: 02/07/11	I really fried the 1981 Johnson 35 a couple of weeks ago. The water intake screen was so old and brittle (motor had been sitting for many years and I had changed the water pump) that it broke off on both sides and apparently the plastic went up into the water pump and destroyed it. We were already overheated, but so stranded at dusk, that we just kept running it to get closer to home (long story). It ran for awhile and then shut off and would not restart. I could turn the crankshaft with my index finger the compression was so low (after it cooled off- the motor would turn with the electric starter still but not crank). It was sizzling and even melted the lower coil's plastic base to the cylinder head. I removed the head tonight and I'm wondering what can I look for to identify any damage. There is some scoring on part of the upper cylinder that I can see and feel pretty well with my fingernail. I'm not sure what to look for if the cylinder gasket is blown. I plan to buy a new motor soon, but would like to get this one running if it's just a cylinder gasket. Thanks as always for any advice. The motor was starting and running great before this mishap. Lee
CES	#2  Posted on 05/19/11 - 7:37 PM
Member Personal Page Photo Albums Project Albums Posts: 2681 Comments: 7 Joined: 04/27/07	Use it as an anchor. Cliff 1966 13' Sport with a 1993 40hp Yamaha 2 Smoker
Tom W Clark	#3  Posted on 05/20/11 - 7:19 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	You now have a wonderful opportunity to upgrade the power on your Whaler.
ioptfm	#4  Posted on 05/20/11 - 8:04 AM
Member Personal Page Posts: 1533 Comments: 3 Joined: 10/28/06	Sounds like you've got a mess on your hands. Look carefully first of all and see if you can see any obvious cracks in the cylinder walls, casings, etc. Tom 1979 Sport 15'
Bake	#5  Posted on 05/20/11 - 8:39 AM
Member Personal Page Project Albums Posts: 902 Comments: 8 Joined: 01/30/06	The question you pose is what should you look for. My first thought is, a newer motor. Not to say you cant fix what you have, but you will likely put more into it than you could buy a newer motor for.
whalerman	#6  Posted on 05/20/11 - 10:56 AM
Member Posts: 540 Comments: 5 Joined: 06/26/07	Put it on Ebay and get what you can for it and put the proceeds tward a newer one. THOM : 1999 Outrage 18, 2012 E-TEC 150, 2012 EZ Loader trailer
John Fyke	#7  Posted on 05/20/11 - 3:53 PM
Member Personal Page Posts: 1307 Comments: 0 Joined: 09/06/06	I wouldn't put any money into that motor. John Fyke Re-Fit or Reef It 1979 15' Sport with Super Sport conversion and 70hp mercury.
surfshark	#8  Posted on 05/20/11 - 6:14 PM
Member Posts: 28 Comments: 0 Joined: 02/07/11	Thanks everyone- I'm actually looking at a jon boat with a 2005 Mercury 25EL 2 stroke tomorrow. Think I'll buy the whole package ($2500) and use the steering, cables, motor from the jb for the Whaler and sell the jb or fix it up later. Would like to have a decent beater jon boat to scrape over the oyster shells! Any advice on the 2005 Mercury 25EL 2 stroke? Thanks again! Lee
CES	#9  Posted on 05/20/11 - 6:22 PM
Member Personal Page Photo Albums Project Albums Posts: 2681 Comments: 7 Joined: 04/27/07	You can pick up a nice 2 stroke 40 HP for less than $2,500 Cliff 1966 13' Sport with a 1993 40hp Yamaha 2 Smoker
John Fyke	#10  Posted on 05/21/11 - 9:07 AM
Member Personal Page Posts: 1307 Comments: 0 Joined: 09/06/06	surfshark wrote: Thanks everyone- I'm actually looking at a jon boat with a 2005 Mercury 25EL 2 stroke tomorrow. Think I'll buy the whole package ($2500) and use the steering, cables, motor from the jb for the Whaler and sell the jb or fix it up later. Would like to have a decent beater jon boat to scrape over the oyster shells! Any advice on the 2005 Mercury 25EL 2 stroke? Thanks again! Lee Sounds like a plan. Better than scraping your whaler over the oyster shells. John Fyke Re-Fit or Reef It 1979 15' Sport with Super Sport conversion and 70hp mercury.