If cam belt breaks is there enough clearance between pistons and head on my 1996 ford lazer?
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What is zero clearance engine?
In an engine, the piston's go up and the valve's that are adjacent to that piston go up. When the piston goes down the adjacent valves go down. This is achieved by the timing belt or chain and the engine timing being set correctly. If the belt or chain breaks, the pistons still go up and down, but the valve's stop moving. On a non clearance engine, the piston will go up and hit the valves, resulting in bent valves and a now needed head job. In a clearance engine, the top of the piston has an inset cut into it that is just enough room to avoid hitting the valves.
Will your engine on a 1997 Avalon be damaged if the timing belt breaks before you replace it?
Why you change the timing belt for 96 Honda civic before 90000 miles?
Because after 90,000 miles you might have to rebuild the engine when the timing belt breaks and the pistons kiss the valves. Far far far cheaper to replace that belt now as opposed to an engine overhaul, not to mention the lead time for major repairs. Over time and miles timing belts stretch and age. If they stretch enough they can slip causing the relationship between the pistons and valves to go out of sequence. In some cars this is catastrophic and causes damage to the valves and possibly destroys the engine when the valves actually hit the pistons. If the belt breaks the same thing happens, usually worse.
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If the camshaft snapped on a Nissan Serena could that have caused damage to the valves?
i think u mean cambelt not shaft as i cant see that snapping. Though the answer for both is the same yea it will damge the valve's and pistons this is because the cam will stop and the crank will keep on goin.This means pistons will meet valves at speed (not good) sometimes on petrol engines there is enough clearance so the 2 wont meet but u dont stand a chance on a diesel.
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Does a broken timing belt ruin the engine?
When a timing belt breaks, the timing of the valves' movement is no longer synchronized with the crankshaft (and the movement of the pistons). On most engines, if the valves open when the piston moves upward, the valve and piston hit each other, which can break off the valve, allowing it to cause more damage to the engine. These types of engines are called 'interface' types. However, on some engines, the valves don't open far enough, and the pistons don't come up high enough for the two to come into contact. So when a timing belt breaks on these engines, the engine stops running, but no internal damage is done. These are called 'non-interface' engines.