Signs that point to an inlet valve problem include leaks that fill the dishwasher when not running, the dishwasher filling too slowly when in use, or the dishwasher not filling at all. Leaks that end up outside of the dishwasher also can indicate an inlet valve problem, and this must be addressed immediately.

Intake valve closes (IVC) quite late (40°-80°after BDC), to provide more time for fresh charge to enter the cylinder, when the pressure level in the inlet pipe is higher than inside the cylinder.

The temperature at the inlet valve is less compared to exhaust valve. Thus the inlet valve is generally made of nickel chromium alloy steel and exhaust valve is made of silchrome steel. the engine has one inlet and one exhaust valve.

The bigger valve is the inlet valve and the smaller one is the exhaust valve. Intake valve is always larger in diameter than the exhaust valve.

The intake valve/rocker will line up with the intake port. The exhaust valve/rocker will line up with the exhaust port.

Are valve springs the same on intake and exhaust valves? “MOST” engines use springs that are the same for both. HOWEVER, a fair amount DO use different springs.

White ash is normal on the exhaust valves, it’s a result of the never ending serch for a cleaner burning fuel.

Heat is the primary cause of valve sticking. High temperaturesin the exhaust valve guide oxidizes oil and forms carbon depositson the valve guide, and these deposits can cause the valve tostick. The most frequent reason for elevated valve temperaturesis valve leakage.

Carbon deposits can form on your valves for a few reasons. Often, carbon deposits are the result of a rich fuel mixture. It can also be the result of oil passing through a worn valve guide. In this case, oil is pulled through the intake valve guide and into the combustion chamber, where it’s burned.

Valve stems can wear from having too much sideways thrust due to stem-to-guide clearance being out of spec and allowing the valve to move laterally, which can cause the valve head to flex when it closes against the seat.

If you get a car with really bad guides that smokes terribly and consumes a lot of oil, don’t plan on driving it long. 2. You will likely wear your vavles, so when replacement time comes you’re looking at new valves in addition to head work.

Many things can cause a valve to drop out. Running the engine too fast (doubtful), backfire (again doubtful), misadjusted valves, weak valve, rotator or keeper. Broken valve spring.

Too much clearance means the valves will likely clatter and, over the long term, cause damage to the valves, camshaft lobes or rocker arms. If there’s too little valve clearance, the valves won’t fully close, causing excessive heat, and the engine will lose power.

Yes, valve lash can affect compression results. Too tight = valve potentially open all the time. However over time it is VERY unlikely that lash would become too tight. It may become looser though.

When do I need to have a valve adjustment? You should have your valve lash inspected at manufacturers recommended intervals. A sure sign that it’s time for a valve lash adjustment is if your engine is making a loud clicking or tapping noise when starting up or if you experience a loss in engine power.

If you have valve clearances (and decent compression if you have a compression gauge), clean the carby. A lean mixture will make an engine backfire through the intake.

If the valve clearance is too small; the valves will never fully close when they should be doing so; and this will eventually burn part of the valve surface off; and cause a constantly misfiring engine. Also, If the valves are too tight, the engine may be running rough either cold, hot or all the time.

An engine backfire occurs whenever the air-fuel mixture in your car combusts somewhere outside the engine’s cylinders. This can cause damage to your car’s exhaust or intake if left unchecked — and it also means that your car’s engine isn’t making as much power as it should, and is wasting lots of fuel.

Generally, the valves will get tighter from the valve wearing into the head.

Trav. Intakes tend to either stay the same or loosen slightly, exhaust get tighter. After a few adjustments they don’t change much if the oil is doing its job and cam lobe wear is minimal. Looseness of the intakes is usually due to cam lobe wear and tightness of the exhaust is due to seat recession.

I would say, set the gap just a little bit larger (for a cold engine), since when the engine warms up, the clearances would tend to shrink a little.

The reason valve adjustments are important is because the constant slamming of the valve causes it to recede ever-deeper into the head. First, the valve is unable to dissipate its heat into the head. Second, that small gap allows exhaust gases past the slightly open valve and seat at great speed.

When valves are said to be set ‘tight’ it means (at least to me anyway) that the lash still exists, but is set at a reduced clearance. If the valves are set tight to the point where NO lash in the valvetrain and PRELOAD (negative lash) is present, that is where valves do not fully seat at temperature and things go bad.

Yes, tight valves can cause misfires. It is effectively the same as a bent valve because the valve is not sealing properly.

Tight valves open up sooner, open up wider, and stay open longer, which too tight can lower compression and burn exhaust valves; compression loss due to valve not seating quick enough on the compression stroke.