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Re: Blown Head Gasket Repair at 600 Miles
Posted: Mon May 01, 2017 9:25 am
by sgkent
Re: Blown Head Gasket Repair at 600 Miles
Posted: Fri Jun 02, 2017 3:47 am
by 72Hardtop
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.
Re: Blown Head Gasket Repair at 600 Miles
Posted: Fri Jun 02, 2017 5:20 am
by Amskeptic
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
Re: Blown Head Gasket Repair at 600 Miles
Posted: Fri Jun 02, 2017 7:23 am
by 72Hardtop
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.