1979 175 Johnson

rebelsniper2

Recruit
Joined
Nov 23, 2008
Messages
1
What is the difference between a 175TL79K and a 175TXL79R.I also have a over heating problem,i removed head covers cleaned and installed new t-stats and pressure valves.Seems to overheat at high RPM.When hooked to a water hose water comes out around top of lower unit. Thanks
 

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: 1979 175 Johnson

The "XL" means extra long drive shaft= 25". Does the engine have a new water pump impeller in it? If you have a water pressure gauge, it should show 6-8 lbs at idle and up to 16-18 at full speed. Have you checked the overheat with a laser temp gun? The horn will go off at 212 degrees. Make sure the telltale hose extends upward to the top of the block, then back down to the cowling nipple. Not sure that it was originally setup that way, but is recommended.
 
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