Is the VG30 used in the Quest/Villager an interference engine?
This is why I'm asking. A neighbor has a '95 that didn't start one day. After removing the distributor, we discoved it doesn't turn when the engine cranks over. If the timing belt is broke and it is an interference engine, wouldn't it have cranked into the valves and jammed, or could it keep cranking?
I'm thinking of "getting it off his hands" but I don't want it if the valves have been jammed.
Is the VG30 used in the Quest/Villager an interference engine?
This is why I'm asking. A neighbor has a '95 that didn't start one day. After removing the distributor, we discoved it doesn't turn when the engine cranks over. If the timing belt is broke and it is an interference engine, wouldn't it have cranked into the valves and jammed, or could it keep cranking?
I'm thinking of "getting it off his hands" but I don't want it if the valves have been jammed.
Thoughts....
The nissan 3 litre is a safe motor, the belt is most likely broke.
Is the VG30 used in the Quest/Villager an interference engine?
This is why I'm asking. A neighbor has a '95 that didn't start one day. After removing the distributor, we discoved it doesn't turn when the engine cranks over. If the timing belt is broke and it is an interference engine, wouldn't it have cranked into the valves and jammed, or could it keep cranking?
I'm thinking of "getting it off his hands" but I don't want it if the valves have been jammed.
Thoughts....
the villager is, the quest isnt, the piston specs between the two are different.
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the villager is, the quest isnt, the piston specs between the two are different.
According to the Gates timing belt guide the Villager 93-98 is safe if the belt breaks but the 99-up 3.3L is not. The quest is listed as not safe for all years in the guide. seems very strange to me I thought the engines were identical.
I got this info here ~>http://www.gates.com/downloads/downl...older=brochure
Very handy if your worried about a timing belt
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How does an interference head work compared to a non-interference head?
Where can I find a write up on this?
-Thanks
Thanks for the info!!!!
This one I can answer. In an interference motor, the piston is down when the valve(s) are open. When the piston reaches top dead center, the valves are closed. When the engine is timed right, the piston and valves never touch. When a timing belt breaks, often the pistons will "coast" into an open valve and bend the valve, or worse, damage the head casting itself.
In a non-interference engine, the valves and the pistons can go "out of time" without resulting in physical interverence, hence no damage if the belt breaks. Usually to obtain a non-interverence engine, there are slight depressions in the top of the pistons for the valves to clear, or the engine has a larger combustion area. (remember that engine size is displacement, or the volume that the the pistons actually move.
This one I can answer. In an interference motor, the piston is down when the valve(s) are open. When the piston reaches top dead center, the valves are closed. When the engine is timed right, the piston and valves never touch. When a timing belt breaks, often the pistons will "coast" into an open valve and bend the valve, or worse, damage the head casting itself.
In a non-interference engine, the valves and the pistons can go "out of time" without resulting in physical interverence, hence no damage if the belt breaks. Usually to obtain a non-interverence engine, there are slight depressions in the top of the pistons for the valves to clear, or the engine has a larger combustion area. (remember that engine size is displacement, or the volume that the the pistons actually move.
You are correct, this makes a nissan 3l V6 a safe motor, I have a 93 villager motor in my garage+300z motor, both can be turned over without interference of the valves. This would make them safe right, do not believe that nissan puts different pistons in to cause interference.
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