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Old 12-02-2011, 17:07   #1
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Yanmar Fuel Filter Housing

well i gone and done it. while bleeding my 1gm10 i manged to strip the bleed screw in the secondary fuel filter housing on the engine. question to the experts out there is this something that can be repaired using a heli coil or am i stuck having to purchase a new housing. thanks
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Old 12-02-2011, 17:37   #2
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Is it a taper thread or does it have a sealing washer under the bolt head.
If its a taper thread bleed screw (unlikely) you may get away with drilling and tapping the next size up. If the thread is parallel with a sealing washer then you should be able to heli coil it, just make absolutely sure the heli coil is below the surface.

A picture would help
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Old 12-02-2011, 17:39   #3
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its not a taper thread just an aluminum housing with a bleed screw and copper washer
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Old 12-02-2011, 17:41   #4
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Forgot to add, buy yourself a small torque wrench.
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Old 13-02-2011, 05:36   #5
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drill it out and tap it to a new larger size. Then locktite the screw in place. Use the larger 12mm headed banjo bolt to bleed the filter.
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Old 13-02-2011, 06:37   #6
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drill it out and tap it to a new larger size. Then locktite the screw in place. Use the larger 12mm headed banjo bolt to bleed the filter.
Indeed.
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Old 13-02-2011, 08:13   #7
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thanks everyone for the tip me thinks this is the route i shall take.
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Old 13-02-2011, 09:14   #8
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Inspect it carefully, my parts/repair guy said that the cast part fairly easily cracks when you over tighten it. So you might have more than stripped threads.

John
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Old 13-02-2011, 09:22   #9
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Inspect it carefully, my parts/repair guy said that the cast part fairly easily cracks when you over tighten it. So you might have more than stripped threads.

John
John,
There are 2 versions of this housing I'm aware of. One has tapped threads and a screw with a cut in it. The other more failure prone unit. Has threads that are cast into the aluminum. The bad part is the threads are 2 segments that are about 150* each. These pull so easily it's embarrassing.
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Old 13-02-2011, 09:24   #10
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mine has a tapped thread with a bleed screw that has a hollow center and a vent hole
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Old 13-02-2011, 09:28   #11
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mine has a tapped thread with a bleed screw that has a hollow center and a vent hole
that would be the larger 12mm headed bolt. Were discussing the smaller 10mm headed bleed screw

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Old 13-02-2011, 09:43   #12
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its the 12mm screw that im referring too.
oops does this mean ive been using the wrong screw for bleeding the system.
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Old 13-02-2011, 09:49   #13
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you pulled the threads on the larger screw? WOW! yeah, you over torqued it.

If it screws into the housing like above. Just tap it oversized. You might need to go to a fractional size to get the next "larger" size.
Yanmar say's to use the smaller screw. But I advise not to because it has a large propensity to pull the threads.
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Old 13-02-2011, 09:53   #14
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im not sure if the previous owner had partly stripped the threads because i didnt use that much force on it. only using a small 12mm wrench. so that being said your saying i should drill it oversize helicoil it then put a new bleed screw in it or just plug it and use the 10mm screw?
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Old 13-02-2011, 09:57   #15
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does the bolt dead head into the housing? or is there a banjo fitting the bolt passes through?

If it dead heads just drill it out over size. I wouldn't use a helicoil. They could leak air around the new larger threads. Again, just over size it.
If it has a banjo fitting on top the bolt passes fuel from. Replace the housing. Their cheap, About $70

It's my standard practice to seal the small bolt with locktite. It has a higher propensity to pull threads
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