What is the valve clearance of a Subaru?

Valve Clearance of a Subaru
The valve clearance for a Subaru varies depending on the specific model and engine type. Here are some examples of valve clearance specifications for different Subaru models:
– For a 2004 STI with shimless valves:
– Intake: 0.20 +0.04 -0.06 mm (.0079 +.0016 -0.024 in)
– Exhaust: 0.350.05 mm (.0138.002 in).
– For a 2002 WRX with shim valves:
– Intake: 0.20 +-0.02 mm (.0079 +-.0008 in)
– Exhaust: 0.25+-0.02 mm (.0098 +-.0008 in).
– For a 2.5L NA engine:
– Intake valves: 0.20 mm ± 0.02 mm
– Exhaust valves: 0.25 mm ± 0.02 mm.
It’s important to note that the valve clearance specifications can vary from engine to engine, and it’s recommended to consult the specific service manual or a qualified mechanic for the exact valve clearance specifications for a particular Subaru model.
If you have a specific Subaru model and engine type in mind, it’s best to refer to the official service manual or consult a professional mechanic for the accurate valve clearance specifications.

What happens if valve clearance is too little?

Effect of valve clearance： If the valve gap is too small, the valve is held up after being heated, so that the valve opens early and closes late, or even can’t be closed. The valve and the valve seat do not cooperate closely, resulting in valve leakage.

How much is too much valve clearance?

On the intake side, if the clearances are too high(More than . 013″), then the valve won’t open all the way. This causes the engine to run rich, which will damage your catalytic converters over time.

Do Subarus need valve adjustments?

The FSM has an extensive write-up for checking and adjusting cam clearance as well as for determining the correct shim thickness. In the PDF’s opening paragraph, it mentions that the valve clearance “does not require inspection and/or adjustment until 105,000 miles.”

What happens if you don’t do valve clearance?

Poorly adjusted valves can lead to a decrease in engine compression leading to a loss of power and excessive wear of the valve and cylinder head.

What is the valve clearance of the Subaru EJ25?

Once again the recommended valve clearances for Cosworth EJ25 camshafts are . 008” +/-. 001” for the intake and . 010” +/-.

Is too much valve clearance bad?

Too much clearance causes the intake and exhaust valves to open late, impacting performance a bit. It also causes the valves to slam onto their seats, causing unnecessary wear.

What are the symptoms of bad valve clearance?

It can cause a tapping or clicking noise coming from the engine. This noise is often more noticeable at high RPM. Or when the vehicle is under load.

What is the recommended valve to piston clearance?

Most cam companies offer conservative P-V clearance recommendations of 0.100-inch clearance for the intake and 0.125 inch for the exhaust side. These are certainly valid for street engines because there is little concern for maximizing compression.

What is the recommended valve clearance?

Opinions may vary between piston and valve manufacturers, but a popular consensus is a minimum clearance of . 080-inch for the intake and . 100-inch for the exhaust. The exhaust valve expands more due to heat from combustion, and therefore needs additional clearance.

How much does it cost to adjust valve clearance?

Auto shops or mechanics charge around $150-$300 for the adjustment, but it depends on the make and model of your car. The process would involve removing the valve cover and measuring the space between intake and exhaust valves and their lobes with feeler gauges.