Painting inside crankcase pan

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Tlitwin
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Painting inside crankcase pan

Post by Tlitwin » Fri May 03, 2019 1:49 pm

I’m having my crankcase pan sandblasted. Is it ok to paint the inside when I paint the outside?
Thanks Tom


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Re: Painting inside crankcase pan

Post by Bills Auto Works » Fri May 03, 2019 1:54 pm

I always paint the inside of any engine I build with Rustoleum Clean Metal Primer (brushed on). Many of these engines I have torn down again after 200,000 + miles & it was still attached. When I was a kid, an old timer told me to do it because the oil travels faster back to the pan on paint vs raw metal. We were discussing racing engines & it probably doesn't much matter in a T, but I just do it out of habit 40+years later!

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Re: Painting inside crankcase pan

Post by twrenn » Fri May 03, 2019 1:55 pm

Someone will surely chime in and say paint it with that "red stuff"...I can't remember what it's called,
but in my un-expert opinion I would say, "why bother"? It's gonna be completely coated/protected with
oil as soon as you first start the engine anyway and will stay that way until the engine is finé! Just my two cents! :D

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Re: Painting inside crankcase pan

Post by DanTreace » Fri May 03, 2019 1:59 pm

Have used red Gyptol for many years on clean inside crankcases. Won't flake, and gives smooth finish for oil splash and drain out. Some bake it on, have just air dried and find it works just super for me.
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Re: Painting inside crankcase pan

Post by DanTreace » Fri May 03, 2019 2:07 pm

And, coated the inside of the hogshead too, plus the underside of the inspection cover. Nice smooth finish for the oil to flow over.

You can see the thin oil film sheeting down the Gyptol finish :P




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Re: Painting inside crankcase pan

Post by Rich Eagle » Fri May 03, 2019 2:59 pm

In 56 years I have never seen any reason to paint inside the engine but am open to new ideas. The folks that rebuilt my last engine did it and they should know.
Rich
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Re: Painting inside crankcase pan

Post by Steve Jelf » Fri May 03, 2019 5:27 pm

IMG_0365 copy.JPG
Glyptal is also called insulating varnish. If you're buying it pays to shop around. Prices range from reasonable to preposterous.
The inevitable often happens.
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Re: Painting inside crankcase pan

Post by Kerry » Fri May 03, 2019 5:39 pm

How hot do you want your oil?
Something to remember is that a T has no oil cooler, it relys on heat transfer into metal to regulate temp, that red poo is a very high heat resistant paint. The hotter the oil gets. thinner it gets, thinner it gets the less hydromatic oil pressure for the babbit bearings you have. As far as I'm concerned, it's only good for modern oil pumped engines with a oil cooler fitted :roll:


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Re: Painting inside crankcase pan

Post by John Codman » Sat May 04, 2019 10:28 am

I have never rebuilt a Model T engine, but have done many modern pushrod V8s. I have never painted the inside of an engine, and never will. I appreciate that the clearances on the T are not as tight as those on a modern engine, but I will not take the chance of a flake of paint getting somewhere where it shouldn't. With all of the oil splashing around do you think that rust would be a problem?l


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Re: Painting inside crankcase pan

Post by hpetrino » Sat May 04, 2019 10:36 am

I'm with those who say no. I can't really think of any particularly good reason to paint the engine inside, and I can think of a couple of potentially good reasons not to.


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Re: Painting inside crankcase pan

Post by d stroud » Sat May 04, 2019 11:13 am

I am not in favor of painting the inside of an engine. As has been said, that may contribrute to some degree of losing some temperature advantage and I don't think there is that much advantage that the oil will flow down that much better. I think the risk of the coating coming off would be worse than if it wasn't there. I can't see that it would make that much difference on a T engine. JMHO Dave
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Re: Painting inside crankcase pan

Post by david_dewey » Sat May 04, 2019 1:15 pm

I can see the gyptal (spelling? That's the red "goop" which is actually red insulating varnish ) being very useful on the inside of the aluminum hogshead, in case of casting porosity. Rolls Royce did this to their aluminum engine castings back in the 1920s & 1930s, if it was good enough for them, it ought to be good enough for the T! :D
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Re: Painting inside crankcase pan

Post by modernbeat » Sat May 04, 2019 1:18 pm

If you are rebuilding an old cast iron block that is saturated with oil, there is no way I'd paint it.
If the block was new, I'd consider cleaning it and painting it to prevent porosity issues.
If the block was used, and thermally cleaned (baked) to eliminate any oil in the casting, I'd paint it.
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Re: Painting inside crankcase pan

Post by Tim Rogers » Sat May 04, 2019 3:52 pm

Completely unnecessary and you're just asking for trouble.
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Re: Painting inside crankcase pan

Post by Original Smith » Sun May 05, 2019 9:28 am

Ford didn't paint them, and neither will I!


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Re: Painting inside crankcase pan

Post by George Hand » Sun May 05, 2019 10:00 am

Painting mine, after sandblasting the bare metal will rust faster than when it was made new, also it may seal any particles of sand not removed from a post blasting cleaning operation. Castings used in farm tractors are routinely sealed at time of manufacture for the same reason contain any casting sand not recovered and also seal any casting porosity.


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Re: Painting inside crankcase pan

Post by Norman Kling » Sun May 05, 2019 10:39 am

I wasn't going to post on this, because it is interesting to find out what is going on and why it is so. However, "It will rust faster" doesn't make sense to me. The oil coats the metal preventing rust. If you drive the car a lot, you will always have some oil splashed around the inside. I am neither for nor against painting it, just think it unnecessary to do so.
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Re: Painting inside crankcase pan

Post by George Hand » Sun May 05, 2019 10:58 am

Norm, Sure motor oil will protect the bare metal providing you clean the rust off the pan, assemble the engine and put it service right away. Most T's are projects that take long periods of time from beginning to end, things like condensation can aid in the deterioration. While we are debating this subject in the amount of time required to do so will paint the inside of my crankcase, each to his own,

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