Re: IN NEED OF A B-ENGINE HEAD ('79) - Saab Saab Model 99 Bulletin Board - Saabnet.com
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Re: IN NEED OF A B-ENGINE HEAD ('79)
Posted by Andy in PDX [Email] (more from Andy in PDX) on Sun, 7 Jun 2009 03:57:32
In Reply to: Re: IN NEED OF A B-ENGINE HEAD ('79), Larry West [Profile/Gallery]
, Thu, 4 Jun 2009 12:45:26
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My experience with 'B' _and_ early 'H' heads is that when they get hot they erode from the inside of the water jacket until they spring a leak around one of the exhaust valves. It's happened on a couple of my cars over the years, and on my ex-wife's pre-APC '82 900T. (I had taught her how to do a tune-up and take a compression test, and one day she called me to ask, "What's it mean when I'm taking a compression test and water is squirting out of one of the other cylinders?" It was a crack around one of the exhaust seats.
The #2 and #3 valves are right next to each other and the area of the head between them gets _very_ hot. Then the coolant boils and the erosion starts. One of the dealer's parts department had a head that had been cut in half to show the erosion.
The '79 900T that I'm currently driving has an electric water pump that was installed by Garth Ankeny, when he owned the car. When he put in the pump, he ended up reversing the water flow through the heater core because he installed a nipple on the downstream side of the pump to which he attached the heater hose that originally connected to the hose going into the mechanical pump. So water that has been cooled by the radiator now runs from the pump, just behind the radiator outlet pipe, through the heater core, and then into the port at the base of the intake manifold, meaning that it is pumping _cool_ water onto the area around the hot valves, instead of pumping hot water from there through the heater.
I'm not sure if that cool water is detrimental or not, but the pump's been in there for at least six years, with no evidence of a cracked head.
posted by 71.214.6...
Posts in this Thread:
- ducktail to the crusher, scott k, Mon, 1 Jun 2009 13:17:36
- Re: ducktail to the crusher, Karl Ronnkvist, Tue, 16 Jun 2009 18:35:01
- Re: ducktail to the crusher, BAAB , Wed, 3 Jun 2009 21:25:31
- parts, scott k, Thu, 4 Jun 2009 05:25:46
- Re: ducktail to the crusher, Karl Ronnkvist, Tue, 2 Jun 2009 14:02:23
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