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  #16  
Old Dec 9th, 12, 09:07 PM
camaroman7d camaroman7d is offline
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Default Re: Water in Oil 406 cu in

I have never coated my MLS head gaskets, they come with as coting on them and both styles Cosmetic and Fel Pro said to install dry.

I would be interested in knowing what type of sealer was used on the head bolts/studs. There is a certain brand that I had issues with before.
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  #17  
Old Dec 10th, 12, 08:57 AM
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Default Re: Water in Oil 406 cu in

I agree with all of the above for the most part. You might wan,t to check the head bolt holes at the top of the block. I have seen them crack on a 400 . The head bolt sealer i use is the brown genuine G/M sealer wich is none other than Permatex Aviation 3 D in a G/M can or the liquid teflon. Alex
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  #18  
Old Dec 10th, 12, 12:44 PM
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Default Re: Water in Oil 406 cu in

Another place to look is at the caps on the crank bolts. I've had a block that leaked at these bolts. Just can't remember if it was at the bolts that were splayed or not. But they went right into the water jacket.
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  #19  
Old Dec 10th, 12, 11:26 PM
97Z4C 97Z4C is offline
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Default Re: Water in Oil 406 cu in

to me = i am wondering if you decked the block and made sure surface was true, especially with steam holes- for me . i use the indian head sealer no matter what gaskets and havent had any issues on my 400s even hundreds of nitrous passes--many may disagree -its just me
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  #20  
Old Dec 11th, 12, 06:01 PM
MickyT MickyT is offline
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Default Re: Water in Oil 406 cu in

Thx for all advice, dont see any signs of cracking however will get magnifier and really look close. Never any overheating. Had a tech tell me that many short run periods can create water in oil situation as it never heats to op temp and that has certainly been case over past several months as it is moved around the body shop.
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  #21  
Old Dec 11th, 12, 07:29 PM
Eleanor's Nemesis Eleanor's Nemesis is offline
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Default Re: Water in Oil 406 cu in

Quote:
Originally Posted by MickyT View Post
Thx for all advice, dont see any signs of cracking however will get magnifier and really look close. Never any overheating. Had a tech tell me that many short run periods can create water in oil situation as it never heats to op temp and that has certainly been case over past several months as it is moved around the body shop.

Out of curiousity, do you use any fuel that contains alcohol....like E-85 or something similar?

Lots of my drag racing friends that use alky as a fuel have told me if they don't get the engine up to temp it will 'milk the oil'. Full synthetic seems to be worse than conventional or semi-syn for this phenomenon.
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  #22  
Old Dec 11th, 12, 11:42 PM
ace's68 ace's68 is offline
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Default Re: Water in Oil 406 cu in

You need to re-torque the heads after a few heat cycles. Aluminum and iron expand at different rates... Also, I've noticed I have to go over ALOT of my intake and especially valve cover bolts because the engine shakes and vibrates so much... Another problem area is main bolts that go into the water jacket. 400's usually crack at the main webbings, especially on 4 bolts, and the mains as well.
FWIW my stock truck vortec L-31 leaked water like a siv because all of the intake bolts were hand tight, it just goes to show the cam doesn't have to be radical engine to back bolts out.
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  #23  
Old Dec 12th, 12, 03:34 AM
DOUG G DOUG G is offline
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Default Re: Water in Oil 406 cu in

Quote:
Originally Posted by camaroman7d View Post
I have never coated my MLS head gaskets, they come with as coting on them and both styles Cosmetic and Fel Pro said to install dry.
IF the heads have any imperfections or the wrong RMS for MLS gaskets they could leak...and it's an extra measure to help prevent a leak.
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  #24  
Old Dec 12th, 12, 08:23 AM
camaroman7d camaroman7d is offline
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Default Re: Water in Oil 406 cu in

Quote:
Originally Posted by DOUG G View Post
IF the heads have any imperfections or the wrong RMS for MLS gaskets they could leak...and it's an extra measure to help prevent a leak.
I understand your point and I have heard of others using baby powder, etc.. I've just never had a problem. Probably jinxing myself now.

I also don't re-torque my heads and never had a problem with that either. Same thing regular fel pro and Cometic says no re-torque needed. Won't hurt to do it, but the few times I have checked the bolts were still tight. Intake manifolds and headers are a different story.
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  #25  
Old Dec 12th, 12, 09:17 AM
68rs406 68rs406 is offline
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Default Re: Water in Oil 406 cu in

Quote:
Originally Posted by camaroman7d View Post
I understand your point and I have heard of others using baby powder, etc.. I've just never had a problem. Probably jinxing myself now.

I also don't re-torque my heads and never had a problem with that either. Same thing regular fel pro and Cometic says no re-torque needed. Won't hurt to do it, but the few times I have checked the bolts were still tight. Intake manifolds and headers are a different story.
This is my experience as well, I have never retorqued my heads. I would suspect the bolts that were loose got missed in the torque sequence possibly.

The short run/ moisture deal is possible, but it depends on how much moisture you are seeing? And as Michael points out anything with alcohol in it really draws in the moisture. Or there is a bolt leaking etc.
But the fact the bolts were loose was likely the problem, I would wonder why they were like that, retorque and change the oil a few times and run it.The only time I have seen loose head bolts other than from not properly tightening is after a nasty nitrous meltdown and a smoked head gasket.
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  #26  
Old Dec 12th, 12, 11:33 PM
6D9 6D9 is offline
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Default Re: Water in Oil 406 cu in

Mikey I had the same problem with my 408 and AFR 195's. Turned out to be the ARP thread sealant was garbage. I removed 1 bolt at a time and used a different sealant. Never had another issue!
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  #27  
Old Dec 13th, 12, 02:05 PM
68rs406 68rs406 is offline
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Default Re: Water in Oil 406 cu in

Quote:
Originally Posted by 6D9 View Post
Mikey I had the same problem with my 408 and AFR 195's. Turned out to be the ARP thread sealant was garbage. I removed 1 bolt at a time and used a different sealant. Never had another issue!
Not the first time I have heard this, I used it on my previous motor and it worked fine, I might have just gotten lucky. It's messy and has a strange consistency though, so I quit using it. I picked up some good teflon paste and have had great luck with it.

That said, it wasn't sealant that caused the bolts to come loose I don't think, but almost certainly the loose bolts caused the leak. I would have to guess the root of the problem is the loose bolts from possibly torquing? And it was not leaking at first I don't believe?
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  #28  
Old Dec 13th, 12, 05:30 PM
grampstoyz grampstoyz is offline
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Default Re: Water in Oil 406 cu in

Are you using washers on the head bolts?
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  #29  
Old Dec 13th, 12, 05:56 PM
MickyT MickyT is offline
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Default Re: Water in Oil 406 cu in

It was ARP sealant. Also using ARP bolts. Weird that all lower bolts both sides (neaerst exhaust ports) were quite loose. I did use a torque wrench to c how tight they were for removing them. Something tells me that is a no no?
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  #30  
Old Dec 13th, 12, 07:01 PM
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Everett#2390 Everett#2390 is offline
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Default Re: Water in Oil 406 cu in

Not really. In reality, a cylinder head gets torqued in place in three steps, it should be un-torqued in the same three steps in reverse pattern. Keeps the head straight.

But then, I've always unscrewed the head(s) in one step and haven't had any problem either.

Only sealants I have ever used are Indianhead Shellac and Permatex A200, on the bolt threads. Never leaked.
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