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RTV silicone on head gasket. Really?

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J Hamilton
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PostPosted: Wed Oct 13, 2021 3:06 pm    Post subject: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

According to the service manual...yes. This
is on a John Deere 950 with a Yanmar engine.
This tractor came in for a head gasket
replacement and reading the torque specs and
installation instructions it said to coat
both sides with RTV silicone. Anyone else
ever seen instructions for that? I have
always read or been told clean and dry or
copper coat if you just have to use
something.

 
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Dave41A
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PostPosted: Wed Oct 13, 2021 4:35 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

I have the little brother 650 and the JD manual (common with the 750) says to install dry. No, I have never heard of using silicone RTV on a head gasket. The previous owner of my Farmall H had used silicone rtv on the manifold gasket and it leaked badly. High-temp RTV is only rated to 550F or so, and Permatex makes a copper RTV that is supposedly rated to 700F. But I do not see even it surviving the heat--maybe it only goes around the water passages. But the authors of the manual have some expertise. Is it a JD manual, or aftermarket?
 
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J Hamilton
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PostPosted: Wed Oct 13, 2021 4:50 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

It's an I&T manual. I'm going to run by the dealer and see what a Deere manual says about it.
 
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Hobo,NC
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PostPosted: Wed Oct 13, 2021 4:52 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

CVPost-Dave41A wrote:
(quoted from post at 06:35:39 10/14/21) I have the little brother 650 and the JD manual (common with the 750) says to install dry. No, I have never heard of using silicone RTV on a head gasket. The previous owner of my Farmall H had used silicone rtv on the manifold gasket and it leaked badly. High-temp RTV is only rated to 550F or so, and Permatex makes a copper RTV that is supposedly rated to 700F. But I do not see even it surviving the heat--maybe it only goes around the water passages. But the authors of the manual have some expertise. Is it a JD manual, or aftermarket?


If it leaked it was not because of the RTV... Yes the RTV turns into a silicon power over time it keeps the gasket from detreating from friction and heat.

I have never coated a head gasket with RTV some do come with a sealing bead that appears to be a silicon seal. You will see it where it would seal off oil galleys/passages and cool passages.
 
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Steve@Advance
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PostPosted: Wed Oct 13, 2021 5:12 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

I've never coated an entire head gasket with silicone.

Seems to me there would be a danger of hydraulic floating of the gasket, let alone the clogging of coolant and oil passages.

I have used silicone to seal studs and bolts that are through drilled to the water jacket.

I have used a VERY thin coat of silicone around an oil pressure galley that passes through the head gasket. I remember the old L series Datsun engines were prone to leak around the oil passage if you didn't.
 
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T.R.K.
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PostPosted: Wed Oct 13, 2021 5:22 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

Well, the only way I got some of those old Minneapolis-Molines not to leak water was to run a bead of silicone around every water passage in the head gasket.

But then MM is the only OEM I have ever seen that said to torque one side of the head 80 ft/lb. and the other side 100 ft/lb.
 
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Fritz Maurer
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PostPosted: Wed Oct 13, 2021 5:31 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

They are probably under the assumption that the technician knows better than to run a 1/8 inch bead around every hole.
 
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Geo-TH,In
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PostPosted: Wed Oct 13, 2021 5:32 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

Believe it or not. In the early 70s a guy in college had a ford 4 cylinder with aluminum heads. I think it might have been a Pinto. Not 100%. I'm thinking it may have been a 2 or 2.2 L engine, over head cam.
It came with a 2 year 24k warranty. During that time Ford replaced the head gasket 2x.
RTV wasn't invented yet, it was clear silicone.
We removed the head, One beer. He applied a thin coat of silicone on head gasket. That took a second bear to let the silicone cure. Another beer to replace the head. The head gasket never leaked. True story. So believe or not, A 6 pk of bud, clear silicone and silicone on head gasket worked.
 
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Duner Wi
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PostPosted: Wed Oct 13, 2021 5:34 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

The Yanmar forum says the manual says this.
Dow Corning/RTV Silicon Gasket Three Bond #50 or equivalent.
 
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rustred
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PostPosted: Wed Oct 13, 2021 5:54 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

Its not that they have 2 different size studs on some. So naturally u need 2 torque values.
 
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Royse
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PostPosted: Wed Oct 13, 2021 5:57 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

Never seen it in a manual but I bought a Ford 8N once that the
previous owner had tried to re-use the old head gasket and get
the flathead to seal with white household caulk. It didn't work well.
 
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Traditional Farmer
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PostPosted: Wed Oct 13, 2021 5:57 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

I'd check the Hoye Tractor website they are the Yanmar tractor experts I'd trust.
 
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SVcummins
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PostPosted: Wed Oct 13, 2021 7:00 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

I tend to follow the manual the engineering department that designed the machine usually knows more about how to fix it that bubba the Charlie Daniels of the torque wrench
 
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J Hamilton
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PostPosted: Wed Oct 13, 2021 7:29 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

I do too. Thats why I have a bookshelf full of service manuals, because I dont know everything. I just never read anything before in one about it.
 
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J Hamilton
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PostPosted: Wed Oct 13, 2021 7:31 pm    Post subject: Re: RTV silicone on head gasket. Really? Reply to specific post Reply with quote

Thanks, I'll look that up
 
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