6g72
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6g72 - 3/18/2007 4:24:58 AM
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grey
Posts: 9
Joined: 3/18/2007
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(that's a 3.0 12 valve ohc)
is this an interference engine?
what happens when the timing belt breaks?
thanks
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RE: 6g72 - 3/23/2007 9:00:16 PM
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ozms
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Joined: 3/23/2007
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yes the 6G72 IS an interference engine... if the belt breaks the engine will lunch itself...
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RE: 6g72 - 3/26/2007 11:30:48 AM
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off roader
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quote:
ORIGINAL: ozms
...the engine will lunch itself...
i.e. On an interference engine the valves will hit the pistons if the timing belt breaks. I would expect on our engines the failure point will only be the valve stems bending and requiring R&R but perhaps someone who's experienced this or know of it happening 1st hand, can elaborate.
EDIT:
I should add that I've been told by folks far more knowledgeable than probably most on here that my 3.0L SOHC engine is NOT an inteference engine. It is a Gen I (1990) SOHC, 12 Valve 6G72.
< Message edited by off roader -- 3/30/2007 7:22:24 PM >
_____________________________
1990 3.0L SOHC V6 4 Door Montero
Custom bumpers, rocker panel protection & skids
Built for wheeling.
1989 3.0L SOHC V6 2 Door Montero
Off road virgin... about to change that <GRIN>
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RE: 6g72 - 3/26/2007 4:05:50 PM
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Dusty Eclipse
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Joined: 2/23/2007
From: 11746,21114,34668
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I blew a belt in my 6G72 once... and it was time for a new engine.
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RE: 6g72 - 3/28/2007 1:47:18 PM
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grey
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Joined: 3/18/2007
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I read something about the pistons being shaped in such a way that the 6g72 could be considered a non-interference. The pistions had a bowl shape on the top or something.
I couldnt remember if the article was about the stock pistons, or aftermarket pistons or if it was even the 6g72 or the 24 valve or what. It was a racing performance type website, so there is no telling what I was reading...
Anyway that is why I asked. I dont want to find out the other way.
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RE: 6g72 - 3/30/2007 10:14:36 AM
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grey
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Joined: 3/18/2007
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okay. tell me where I'm wrong...
I went looking for that page I was reading and found it.
here is an exerpt, but if you read the page you will see that it is abit confusing...I am not sure if he means the 6g72 that is in the 1989 montero.
"A BIG question that runs rampant through the mailing lists, and seems to be full of disinformation, whether these motors are interference or not. By interference, I mean if the timing belt breaks, will the pistons and valves hit. I'll let Robert Carter answer this one…
Read on: Straight from '88 Van FSM Page 9-51 "Pistons: Are aluminum alloy with a steel strut, short height, and thin wall so as to be autothermic and light weight. The piston head with valve recesses, in combination with the cylinder head, forms a compact spherical head WITH CLEARANCE FOR TOTAL VALVE LIFT WITH PISTONS AT TOP DEAD CENTER." I think this answer's the long debate on whether or not the 3.0 is an interference engine.
And for the record, my 87 and 92 FSMs (Factory Service Manuals) back this up too."
you can read the whole page here:
http://home.pacbell.net/fong8/gstuff/6G72.htm
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