I'm new here, but I think I have a problem, and I thank all for any and all help. I stripped the thread on 1 of the ports (upper right from the back). I've been reading some of the info, and I thought I would ask for some specifics. I am not a mechanic, so what are my options? 1) I've heard of 'thread chaser'- difficult? fix the problem? est'd cost if I DIY? 2) helicoil- need to remove head? is that difficult? est'd cost DIY? est cost if I take motor to a boat repair shop? fix the problem? 3) ???- what are my other options, and est $ to have done?? This is a great forum, and I thank you in advance for some help.
Remove the head and take it to a machine shop to have Helicoil installed. Replace head using a new head gasket and torque head bolts acording to shop manual values and tightening sequence. Retorque after ~ 10 hours running time.
thanks for the info- 1) is removing the head fairly straight-forward, or is there a list of 'do's and don't's'?? 2) what would be a fair price to pay at a machine shop or boat motor repair shop for them to install the helicoil?
I would do the job for under $50. It's 10 minutes work with the correct equipment. Head will come off easy. I always back the bolts off a little at a time till they are all loose in reverse order of tightening them but that's just me !
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1985 Doral 164 1985 140hp Johnson EZ loader single axle trailer all = a whole lot of family fun !!!!
No need to remove head cover (smaller cap screws); typically 10 head bolts get removed (remove spark plugs, clear any hoses and wiring first). Head will come off (sometimes it takes a little persuasion to pop it loose.
Take one spark plug to the machine shop with the head. Typically most shops will do the Helicoil for ~$25 and an auto machine shop will do fine as an alternative to a general machine shop.
Replacing the head will require several things
a) a new head gasket
b) install head dry (no sealers are needed)
c) Clean any gasket remains off head an block, being careful not to nick either surface
c) head bolts are tightened in a sequence, starting from the center, and working back and forth to alternate ends, using a torque wrench and working up to the final torque value in 5 ft lb increments to 18 to 20 FT-LBS.
Sequence is:
7 ....... 8
3 ....... 4
2 ....... 1
6 ....... 5
10...... 9
d) Retorque after ~ 10 hours running
wow! You folks really mean business! I will be going up to my cabin at the end of the month and take a look at what you've all spelled out for me- the boat is stored for the winter, but I will do some checking around - maybe pull the head off (?) so that I can get at it in March- again, I really appreciate the help, and I will give an update after I finish up in the spring. Again, thank you.
115hp 1978 Evinrude spark plug stripped
Linear Mode
