Engine valve problems begin to occur when your engine is subjected to overheating, lack of lubrication or over-revving. The timing belt on your engine breaks while driving, serious internal engine damage may occur. This is particularly true if you car is equipped with an interference engine During engine rebuilding, care must be taken to ensure proper clearance is maintained between the pistons and valves and to ensure valve reliefs on piston tops are aligned properly with the intake. Check the valve lift specification before final valve train assembly is complete. If any of these specifications are incorrect if you are not able to find the cause then you can visit us at PARTSAVATAR AUTO PARTS, TORONTO we will diagnose and fix the issue.

1. Causes of a Bent Valve in a car’s engine
Engine valve problems begin to occur when your engine is subjected to overheating, lack of
lubrication or over-revving. Bent valves will not only damage pistons but also valve guides,
camshafts and valve train components.
Some of the main causes are:
1. Broken Timing Belt:
If the timing belt on your engine breaks while driving, serious internal engine damage may occur.
This is particularly true if you car is equipped with an interference engine. Interference engines have
close tolerances between the valves and the tops of the pistons. After a timing belt of car’s engine
breaks, the engine continues turning long enough for the pistons and valves to come in contact. This
happens because the pistons and valves are no longer in time with each other. The damage may

2. include bent valves, broken pistons and damaged engine heads.
2. Engine Over-Revving:
Depending on the engine your car is equipped with, there is a maximum number of revolutions per
minute you can safely operate your engine at. When the maximum safe rpm rating is exceeded even
for a short time, extensive engine damage can occur, including bent valves. When an engine is over-
revved, the valves can "stretch" and come in contact with the pistons. During over-revving, the
engine may not maintain proper timing and allow the valves to contact the tops of the pistons
causing severe piston damage and bent valves.
3. Insufficient Engine Maintenance:
Problems such as lack of lubrication and engine overheating can also cause bent valves. If you
continue to operate your engine while it is overheated, internal engine tolerances will be reduced to
the point that the valves can stick in the valve guides, causing the valves to contact the pistons.
Similarly, insufficient lubrication can cause valves to stick in the guides, resulting in the valve being
bent when it strikes the pistons. On overhead valve engines, lack of lubrication and overheating can

3. cause lifters to stick, resulting in both bent valves and bent pushrods.
4. Engine Rebuilding:
During engine rebuilding, care must be taken to ensure proper clearance is maintained between the
pistons and valves and to ensure valve reliefs on piston tops are aligned properly with the intake and
exhaust valves. Use caution when milling heads so that the proper valve to piston specification is
maintained. Check the valve lift specification before final valve train assembly is complete. If any of
these specifications are incorrect, you could end up with bent valves when you start up your rebuilt
engine for the first time.

4. And if you are not able to find the cause then you can visit us at Partsavatar Autoparts, Toronto. We
will diagnose and fix the issue.