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Old 07-22-2019, 12:10 PM   #1
Tyson
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2002 L-Series 3.0L Sedan
Default Bolts

I replaced a water inlet unit but lost a torque bolt. Do I have to use those exact bolts or can I use any that fit. Right now I put on Allen wrench bolts

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Old 07-22-2019, 12:17 PM   #2
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Default Re: Bolts

Any bolt, including Allen bolts will work. Since these bolts are not for high load use like suspension or brakes, any bolt is ok. As long as threads match, the smaller head diameter of Allen heads may require a flat washer to distribute loads across a larger diameter on aluminum parts. The preferred hex head bolts distribute head loads over larger surfaces.

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Old 07-22-2019, 12:40 PM   #3
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Default Re: Bolts

Thank you sir. Once again this is Tyson. I appreciate you. You may remember I installed that inlet water unit a few weeks ago. Darn thing started leaking again. I took it apart and the o ring wasnít seated right. So I reseated it but it still is leaking. So now Iím having GM send me a new one. Iím thinking either the o ring is not doing itís job or I donít know. Do you have any idea

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Old 07-22-2019, 01:44 PM   #4
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Default Re: Bolts

Sometimes when things are disassembled, they don't go back together as well before they were disassembled. With aluminum parts, cast aluminum and seals for cooling systems must fit correctly to show for normal expansion and contraction. Check for deformation of mating surfaces and how the seal works to prevent coolant leaks. A dry fit can sometimes determine where parts mate incorrectly. Flat mating surfaces with either flat gasket to act as the soft interface to slight parts not fitting perfectly seals against leaks. O-rings fit in half a channel while the other half channel is the mating part for sealing.

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Old 07-22-2019, 08:26 PM   #5
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Default Re: Bolts

So I think youíre talking about my water inlet unit. What youíre saying is to make a gasket for this part? Iím wondering how that would be possible? Considering the unit doesnít have much area for the gasket. I thought about it though, but I guess I just canít figure out how to go about forming the gasket. It wouldnít have to be perfect but Iím worried that it would cause more leaking than not

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Old 07-22-2019, 08:46 PM   #6
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Default Re: Bolts

No, no, I was describing things in general. If the part you're having a leak uses a O-ring, use a new O-ring. If a gasket is used, use a new gasket. Both compress a little to form a seal. There's a little science to parts that need to be sealed against leaks.

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Old 07-22-2019, 09:28 PM   #7
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Default Re: Bolts

Oh ok got ya

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