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Cracked GIL Exhaust manifolds

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Old 04-18-2004, 09:46 AM
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I have used Gil Offshore for ten seasons and finally the stainless tailpipes leaked. A small leak that caused a miss at idle. I thought that was an excellent track record.
But, if they have a problem because of some bad castings, then Gil should make good on them. Ship them out for inspection now.

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Old 04-18-2004, 11:28 AM
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I wonder why the crack there? Getting hot?
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Old 04-18-2004, 03:46 PM
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I thought the manifolds used on the HP motors are Mercruiser and only the risers are Gil? At least the casting name on mine was "Mercruiser"
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Old 04-18-2004, 06:43 PM
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My understanding is that they are made for Merc by Gil.
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Old 04-18-2004, 07:08 PM
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I've got a used set,with tail pipes.

If you can use them let me know
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Old 04-18-2004, 09:26 PM
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GIL DOES NOT BACK THEIR PRODUCT
THEY TELL YOU TO SEND THEM FOR INSPECTION THEN THEY TELL YOU THERE IS NOTHING THEY CAN DO
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Old 04-18-2004, 09:32 PM
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I have a set of Gil Manifolds on My smallblock that are 17 years old,I stripped and re-powdercoated last year and the inside still looks like new.The boat is not docked and never been in Salt. I think that says something for an aluminum manifold.





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Old 04-18-2004, 09:51 PM
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Ive been using Gils for 15 years and never had a problem. Aside from the fact that I cant get at my plugs (twins on 32" centers) I have been very happy with my gils
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Old 04-18-2004, 10:28 PM
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Are the Gil exhaust cracking in the manifold or the stainless riser? I have my set off and I am wondering how would I pressure test the riser? I cant plug up the outlet inside the riser.
 
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Old 04-18-2004, 11:15 PM
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Mine cracked in the manifolds. Right at the top where the cylinder divider walls are. Both manifolds were cracked in the same place. They were only hairline cracks, but I suspect with heat and h2o pressure, that they were leaking a decent amount while running.

The risers were also starting to get hairline cracks on the interior welds.
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