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Esselte Regular Location: Vic Registered: June 2003	Re: WTB Supra Sat, 16 August 2003 09:38 The Pre-Catalytic Converter (Pre-Cat) location is potentially another likely factor for BHG. CAT's typically have very high optimum operating temperatures. The location of the Pre-CAT provides an additional huge heat source during vehicle operation and immediately after shut down. This stagnant heat will provide an unequal heat source to the number 5 and 6 cylinders. The engine head will expand slightly more around these cylinders, especially on the exhaust side, therefore the gasket along this region would be more severely affected. The gasket will soon fail because of the additional stress in this region. Almost all BHG in the turbo engines usually fail on the exhaust side of cylinders 5 and 6 because the of where the Pre-Cat is located on 7MGTE's. The presence of the heater hose that plumbs off of the rear of the engine by the # 6 cylinder can collect and retain the heated coolant during vehicle operation. The stored coolant because of the geometry and plumbing of the hose can inhibit sufficient flow into and out of the hose. This once again, is another heat source and potential BHG contributor. The heated coolant trapped in the hose will provide additional heat stress particularly on cylinder # 6. Once the motor is shut down, then the trapped coolant can allow unequal contraction of the head during the cool down stage. The head can then warp, thus causing improper head and gasket sealing during the next operation. BHG may potentially appear by cylinder # 6. The main derivative to all the various failure mechanism is HEAT. The aim should be to reduce it, avoid it, and remove the residual sources. Therefore, unending attention should be made to the cooling system. Watch it diligently, scrutinize it often, flush it annually, change it regularly. Other culprits are: The HG - if you haven't experienced a BHG, the pay close attention to your coolant quality and state and the temperature on the guage cluster because it may be immenent. If you will replace the gasket, then get the newest version from toyota or better a MHG type. Retorque the head bolts and reinspect the often. Get an exhaust downpipe, the section from the turbo to the second cat on turbo cars or a header for N/A's. These exhaust mod's will usually remove the first CAT and you'll gain a benefit - a less restrictive exhuast which will improve HP. You can also plumb the rear intake heater hose to the the radiator or the water jacket. This will allow a constant flow of coolant from the rear of the engine, thus keeping cooler water flowing around the rear cylinders. - Your point was that retorquing the head gasket will totally alleviate the problem. So how is this citation from the article i linked above incorrect? Don't pretend this is a tech issue, it's got nothing to do with me knowing what i'm talking about, you've both just attemped to personally attack me. You're like prep children. Neither of you cited tech articles, you said look up 7m-gte on google, i have, many times, and what i've found is many articles talking about how weak the head of the 7m-gte is, despite re-torquing. Even now i'm attempting to stick to tech points, but seeing as the post stands despite your blatant abuse of the forum rules, i may as well reply. [Report message to a moderator]

	Subject	Poster	Date
	WTB Supra	Layoric	Mon, 11 August 2003 05:35
	Re: WTB Supra	Esselte	Mon, 11 August 2003 05:58
	Re: WTB Supra	Layoric	Mon, 11 August 2003 11:30
	Re: WTB Supra	turbokid	Tue, 12 August 2003 00:10
	Re: WTB Supra	Esselte	Tue, 12 August 2003 09:42
	Re: WTB Supra	7M-Brisbane	Thu, 14 August 2003 12:40
	Re: WTB Supra	gianttomato	Thu, 14 August 2003 13:04
	Re: WTB Supra	Esselte	Thu, 14 August 2003 13:48
	Re: WTB Supra	Esselte	Thu, 14 August 2003 14:14
	Re: WTB Supra	7M-Brisbane	Fri, 15 August 2003 14:10
	Re: WTB Supra	Esselte	Fri, 15 August 2003 15:31
	Re: WTB Supra	gianttomato	Sat, 16 August 2003 00:03
	Re: WTB Supra	Esselte	Sat, 16 August 2003 02:29
	Re: WTB Supra	gianttomato	Sat, 16 August 2003 02:33
	Re: WTB Supra	Esselte	Sat, 16 August 2003 02:44
	Re: WTB Supra	gianttomato	Sat, 16 August 2003 02:51
	Re: WTB Supra	Esselte	Sat, 16 August 2003 03:05
	Re: WTB Supra	gianttomato	Sat, 16 August 2003 03:07
	Re: WTB Supra	Esselte	Sat, 16 August 2003 03:09
	Re: WTB Supra	gianttomato	Sat, 16 August 2003 03:28
	Re: WTB Supra	Esselte	Sat, 16 August 2003 06:23
	Re: WTB Supra	gianttomato	Sat, 16 August 2003 07:35
	Re: WTB Supra	SupraBOY	Sat, 16 August 2003 02:25
	Re: WTB Supra	7M-Brisbane	Sat, 16 August 2003 09:03
	Re: WTB Supra	Esselte	Sat, 16 August 2003 09:21
	Re: WTB Supra	Esselte	Sat, 16 August 2003 09:38
	Re: WTB Supra	7M-Brisbane	Sat, 16 August 2003 09:38
	Re: WTB Supra	7M-Brisbane	Sat, 16 August 2003 09:48
	Re: WTB Supra	Esselte	Sat, 16 August 2003 09:57
	Re: WTB Supra	7M-Brisbane	Sat, 16 August 2003 10:23
	locked thread	DannyGT4	Sun, 17 August 2003 04:32

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