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7th August 2017, 01:21 PM
#1
Legendary
Seized spark plugs
In my work, I deal with small motors, usually 10 to 40 HP air cooled, single, two and four cyclinder, although we also have some water cooled engines similar to car engines. Our shop has noticed and increasing occurrence of spark plugs seizing in aluminium motors, stripping out the threads when removed. Initially this happened predominatly in Kawasaki motors, but has now spread to Kohler and Honda motors. Kawasaki has mentioned it in a tech bulletin, recommending the use of anti seize on plugs. The other manufacturers have yet to comment. I am just putting this up here as my belief is that there has been a change to the alloy that aluminium heads are made from or the construction of spark plugs or something that is causing this issue. I wondered if anyone has noticed this in the motor vehicle trade in aluminium heads? I recommend using a small dab of anti seize on spark plugs anyway as it seems to solve the problems.
2005 GU IV ST 3.0. Snorkel. Roof rack. Awning. Spots. Welded I/C. Dual batteries & VSR. UHF. Barn door hinge extension. Roof top spot lights. Rear drawers. 2" lift. NADS. EGT and boost gauges. Trans temp and water temp gauges. Provent 200 catch can. Rear ladder
And crawling on the planet's face, some insects called the human race. Lost in time. And lost in space... and meaning.
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The Following 3 Users Say Thank You to 4bye4 For This Useful Post:
Avo (7th August 2017), mudnut (7th August 2017), threedogs (7th August 2017)
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7th August 2017 01:21 PM
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7th August 2017, 02:20 PM
#2
Patrol God
Definitely use the anti-seize since I found a nearly seized plug in the RB30 head, the first time I changed out the plugs. I ended up buying the right sized tap and cleaned up the thread. It was bloody close to being a helicoil repair.
My advice is: not to follow my advice.
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7th August 2017, 04:02 PM
#3
Patrol God
3 kawasakis a 5 kholer motors on the farm,i may have to have a look and apply anti sieze...cheers.
Watch this space, as there maybe a comment added soon
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7th August 2017, 04:46 PM
#4
Legendary
Originally Posted by
Avo
3 kawasakis a 5 kholer motors on the farm,i may have to have a look and apply anti sieze...cheers.
If your spark plug comes out about a quarter of a turn then jams, screw it back in until you have a new head or motor ready to go. Usually it comes out that far then grabs the thread an rips everything out. Motors are Kawasaki FH451 and FS481, Kohler CH18 and CH20 and also CH680. Now starting to see it on all sorts of engines with aluminium heads, including Kabota and Kohler Aegis which are watercooled motors.
2005 GU IV ST 3.0. Snorkel. Roof rack. Awning. Spots. Welded I/C. Dual batteries & VSR. UHF. Barn door hinge extension. Roof top spot lights. Rear drawers. 2" lift. NADS. EGT and boost gauges. Trans temp and water temp gauges. Provent 200 catch can. Rear ladder
And crawling on the planet's face, some insects called the human race. Lost in time. And lost in space... and meaning.
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The Following 2 Users Say Thank You to 4bye4 For This Useful Post:
Avo (7th August 2017), mudnut (7th August 2017)
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7th August 2017, 06:35 PM
#5
Rotaredom
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7th August 2017, 06:41 PM
#6
Expert
yep always put a little anti seize on the threads when going into alloy heads
gone to the dark side 2017 vdj 79 dc
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7th August 2017, 08:45 PM
#7
Patrol Freak
use the al based anti seize works better then the copper one.
if its worth doin its worth over doin
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The Following User Says Thank You to garett For This Useful Post:
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8th August 2017, 11:04 PM
#8
Legendary
I make mine by mixing lithium grease with graphite powder.
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The Following User Says Thank You to dom14 For This Useful Post:
GQtdauto (8th August 2017)
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