The bad news is you may not be able to rebuild your motor...If all it is (is) the headgasket, great news--change it and be on your way. But it is probably more than that--shifted cylinder liner, or cracked block are the most likely causes. For those, there really is no rebuild. I am assuming your engine is a 4.2 as well, from an LWB. How many miles? The aluminum block tends to develop a hairline crack that expands when the engine is heated, causing coolant pressurization. A loose cylinder liner also is very common as the steel liner in the aluminum cylinder comes loose and thus allows coolant to "float" the liner. If this is the case, a new headgasket will fix the prob for a few thousand miles, then destroy HG again. Cheapest fix is a new engine. Right now, my '92 3.9L Range Rover w/190k on it needs at minimum a new HG. It still runs great, but pressurizes the cooling system. We don't drive it so we don't have your situation happen on the highway. Good luck. 4.0L motor is considered the best of all the Rover V8's with the exception of the 3.5L engine which has no power.
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Current:
2005 Land Rover LR3 V8 SE
2000 Land Rover Discovery II SD
1992 Land Rover Range Rover County
Also current:
1995 Mercedes-Benz E320 Wagon
2002 Volkswagen Eurovan GLS
1996 Ford Explorer LTD 2WD
1982 Volvo 240 GL Diesel
Previous Rover:
1995 Range Rover 4.0SE
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