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Plug size
Posted: Wed Apr 27, 2011 5:24 pm
by socofn
In amongst my other issues i found that I have two different size spark plugs, larger on the drivers side. I will post pictures of the plugs side by side when the wife brings the camera home. Not sure why the PO did this. JP
Re: Plug size
Posted: Wed Apr 27, 2011 6:49 pm
by airbur
Are you sure they are different sizes or maybe just different brands/types? All be threads should be he same on the block.
Re: Plug size
Posted: Wed Apr 27, 2011 7:29 pm
by Moab Mike
airbur wrote:Are you sure they are different sizes or maybe just different brands/types? All be threads should be he same on the block.
Funny you say that, my wife's 4runner came with factory plugs on one side and replacements on the other. i guess the PO needed to save some mula! WHAT AN
!!!!!!!!!
Re: Plug size
Posted: Wed Apr 27, 2011 7:46 pm
by cobshane
76fordbronco wrote:airbur wrote:Are you sure they are different sizes or maybe just different brands/types? All be threads should be he same on the block.
Funny you say that, my wife's 4runner came with factory plugs on one side and replacements on the other. i guess the PO needed to save some mula! WHAT AN
!!!!!!!!!
Must of been to much interference for the guy working on it. Was it the left side?
Re: Plug size
Posted: Wed Apr 27, 2011 7:51 pm
by akaFrankCastle
Weren't there different size plugs required for some different years of heads? If so, wonder if this motor is running two separate years/styles of heads.
Re: Plug size
Posted: Wed Apr 27, 2011 8:24 pm
by socofn
Different size (diameter) bigger around. Yes they were on the left/drivers side. The guy I bought it from had it for 6yrs and never did anything with it as he has a Moab special. I replaced the ones on the right side and re-gapped the other ones. I will buy replacements when I get a chance. No way it is running as both fuel tanks are lying on the garage floor. JP
Re: Plug size
Posted: Wed Apr 27, 2011 8:26 pm
by Shawns Fords
My 68 302 4V head had larger plugs 13/16" than later models 5/8" I used to know this all by heart but have lost memory from many various brands of wobbly pops. more than likely someone changed a head out when another one was broken somewhere down the road.
Re: Plug size
Posted: Wed Apr 27, 2011 8:30 pm
by socofn
That is what I kinda figured, someone along the line replaced a head. I will make it work till I can get the funds together to replaced the engine. JP
Re: Plug size
Posted: Wed Apr 27, 2011 8:58 pm
by Viperwolf1
Yep, someone swapped a head. Early plugs were 18mm thread and later plugs were 14mm. The change was sometime mid-70's.
Re: Plug size
Posted: Wed Apr 27, 2011 9:19 pm
by Moab Mike
coberlyshane wrote:76fordbronco wrote:airbur wrote:Are you sure they are different sizes or maybe just different brands/types? All be threads should be he same on the block.
Funny you say that, my wife's 4runner came with factory plugs on one side and replacements on the other. i guess the PO needed to save some mula! WHAT AN
!!!!!!!!!
Must of been to much interference for the guy working on it. Was it the left side?
Passenger side was replaced by the PO I'm guessing around 115K miles, drivers side was factory original @ 155K miles when I replaced them a month ago. I only new they were bad because the engine started missing. I replaced them all and it was more difficult on the DS.