Blown Head Gasket Repair at 600 Miles

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sgkent
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Location: Citrus Heights CA (near Sacramento)
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Re: Blown Head Gasket Repair at 600 Miles

Post by sgkent » Mon May 01, 2017 9:25 am

Thank You -

Merlin The Wrench

Machine Work/Shop Recommendations: http://kentcomputer.com/77VW/machinework.pdf

Pointers on rebuilding an engine: http://kentcomputer.com/77VW/rebuilding_a_vw_engine.pdf

72Hardtop
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Location: Seattle, WA./HB. Ca./Shizuoka, Japan
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Re: Blown Head Gasket Repair at 600 Miles

Post by 72Hardtop » Fri Jun 02, 2017 3:47 am

sgkent wrote:
Mon May 01, 2017 9:25 am
tech bulletin from RAtwell

http://www.ratwell.com/mirror/www.dolph ... hbull.html
In reality viewed as:

1. To eliminate seizing of pistons, increased piston/cylinder clearance from 0.03mm ± 0.008mm to 0.045mm ± 0.005mm.


2. Eliminate aluminum seal 021 101 341A between cylinder and cylinder head.

Eliminate paper gasket 021 101 341A between foot of cylinder and crankcase.

Install 1.6mm aluminum shim 071 101 341, with adhesive D 000 400 at foot of cylinder to compensate for removed paper gasket and aluminum
seal. Illustration 1.


3. To improve heat transfer, oil groves on both sides of the connecting rod to allow oil splash to cool bottom of the piston.
1972 Westy
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Bosch SVDA w/Pertronix module & flamethrower 40K coil (7* initial 28* total @3200+)
NGK B5ES @ .028
002 Trans
Hankook 185R14's

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Amskeptic
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Re: Blown Head Gasket Repair at 600 Miles

Post by Amskeptic » Fri Jun 02, 2017 5:20 am

72Hardtop wrote:
Sat Apr 29, 2017 9:19 pm
The sealing rings are aluminum. The heads are aluminum. Same material. Removing them (sealing rings) does not speed up and/or alter transfer.
Oh, but it does. Just like when VW used aluminum washer under the TS 2 to **slow down the warm-up**. Customers were complaining about a stumble during warm up. This dumb little washer helped to maintain a slightly richer signal for only a couple of minutes as the engine arrived at operating temperature.

The heat transfer we're talking about as an engine tackles a full-throttle hill is almost momentary but it is critical.
Colin
BobD - 1978 Bus . . . . . . . . . . . 111,155 miles
Chloe - 1970 bus . . . . . . . . . . . 206,820 miles
Naranja - 1977 Westfalia . . . . . 104,650 miles
Pluck - 1973 Squareback . . . . . . 55,570 miles
Alexus - 1991 Lexus LS400 . . . 78,885 miles

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: Blown Head Gasket Repair at 600 Miles

Post by 72Hardtop » Fri Jun 02, 2017 7:23 am

Amskeptic wrote:
Fri Jun 02, 2017 5:20 am
72Hardtop wrote:
Sat Apr 29, 2017 9:19 pm
The sealing rings are aluminum. The heads are aluminum. Same material. Removing them (sealing rings) does not speed up and/or alter transfer.
Oh, but it does. Just like when VW used aluminum washer under the TS 2 to **slow down the warm-up**. Customers were complaining about a stumble during warm up. This dumb little washer helped to maintain a slightly richer signal for only a couple of minutes as the engine arrived at operating temperature.

The heat transfer we're talking about as an engine tackles a full-throttle hill is almost momentary but it is critical.
Colin
Placebo effect. Cost? Nothing. That little washer wasn't a washer but a spacer (022 133 079) and due to it's size (much bigger than a simple thin washer) delayed (1-2mins) heat due to it's size compared to without.

The gasket that was used in the head was very thinly layered aluminum. The layering certainly didn't help retain durability.
1972 Westy
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Bosch SVDA w/Pertronix module & flamethrower 40K coil (7* initial 28* total @3200+)
NGK B5ES @ .028
002 Trans
Hankook 185R14's

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