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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 11-14-2019, 03:02 AM   #1
bobel
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FA20 Reassembly - what sealants and where?

Just wondering what sealants people are using when rebuilding the FA20?

When I stripped my stock engine there was quiet a few strands of RTV caught in the pick-up mesh and itís not really that surprising when you see how much RTV is used from the factory

Has anyone tried using some Anaerobic sealants as an alternative in some locations? Iím thinking of places like between the case halves and maybe the lower cradle/ sub-assembly where itís clean tight fitting machined surfaces. I was planning to use Permatex 51031

As far as RTV goes what are peopleís go to....and are you using the OEM bead recesses (e.g. inner lip of the front cover) or smearing across the entire flange faces?
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Old 11-14-2019, 03:41 AM   #2
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I suggest to do homework and consult manuals in depth regarding that. Recall botched cases of valve spring recall job on older twin with killed engine due sealant bits blocking off oil passages, so one should use right sealant, of right amount, at right places, not go by hunch/from experience on other engines and experiment with different replacements and different application.
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Old 11-14-2019, 07:51 AM   #3
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Permatex 51813 / Loctite 518
Everywhere besides at the end of the head gasket where the gap is too large for it to work correctly.

Last edited by solidsnake11; 11-14-2019 at 08:43 AM.
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Old 11-14-2019, 08:07 AM   #4
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Quote:
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I suggest to do homework and consult manuals in depth regarding that. Recall botched cases of valve spring recall job on older twin with killed engine due sealant bits blocking off oil passages, so one should use right sealant, of right amount, at right places, not go by hunch/from experience on other engines and experiment with different replacements and different application.
I think Iím general your right, but I guess my issue is that if I go by the Manual and stick with the OEM application than Iím highly likely to see RTV in the pickup again.

Also from my assessment of the engine during disassembly the OEM application look very heavy handed and unusual in some locations.
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Old 11-14-2019, 09:58 AM   #5
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Permatex 51813 / Loctite 518
Everywhere besides at the end of the head gasket where the gap is too large for it to work correctly.
Excellent thatís great info. From a look at the spec sheets I think the Permatex flange sealant iíve gone with is pretty much the same just with a higher temp range so that should work.

Have you had any issues splitting the block or removing the front cover for example having used them?
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Old 11-14-2019, 10:41 AM   #6
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I would stick with the manufacturer's suggestions, Subaru engines can be problematic if not sealed correctly.
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Old 11-14-2019, 12:28 PM   #7
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Goto the toyota or subaru dealership. they have sealant that comes in a calking gun tube and is the best sealant ever. It would definitely be worth your money. Plus locktite
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Old 11-14-2019, 12:50 PM   #8
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I would stick with the manufacturer's suggestions, Subaru engines can be problematic if not sealed correctly.
Wonder if Subaru mechanics use the recommended manufacturer's sealant when they do the valve recall.
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Old 11-14-2019, 12:55 PM   #9
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Quote:
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Wonder if Subaru mechanics use the recommended manufacturer's sealant when they do the valve recall.
I'd imagine the recall parts kit comes with it.
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Old 11-14-2019, 02:53 PM   #10
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Just make sure you don't add too much and you will be good.
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Old 11-14-2019, 03:18 PM   #11
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Quote:
Originally Posted by solidsnake11 View Post
Wonder if Subaru mechanics use the recommended manufacturer's sealant when they do the valve recall.

I'm sure they do, the issue I've heard is they aren't following the "map" of how much sealant and where.
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