The torque on spark plugs for a Subaru SVX is 21 Nm (2.1 kgf-m, 15.2 ft-lb). It is important to note that this torque value should be applied to only new spark plugs without oil on their threads. If the threads are lubricated, the torque should be reduced by approximately 1/3 of the specified torque to avoid over-stressing.
Contents
- How tight should spark plugs be tightened?
- How many foot pounds should spark plugs be?
- What are the symptoms of spark plugs not tight enough?
- How tight should Subaru spark plugs be?
- Can you torque spark plugs without torque wrench?
- What torque wrench do I need for spark plugs?
- How do you tighten a spark plug gap?
- Should spark plugs only be hand tight?
- What is the torque spec for spark plugs?
- Should you put anti seize on spark plugs?
How tight should spark plugs be tightened?
Screw in the plug until it “seats,” that is, it’s finger tight. Turn the plug an additional ¼ turn. If you’re installing a new plug, screw in the plug until it seats, then turn it an additional 2/3-3/4 turn. This crushes the washer between the plug and the head, forming a tight seal.
How many foot pounds should spark plugs be?
A. Using A Torque Wrench:
| Spark Plug Seat Type | Plug Thread Size (Millimeter) | Recommended Turns For Cast Iron Heads |
|---|---|---|
| Gasket Spark Plugs | 10MM | 8-12 LB. FT. |
| 12MM | 10-18 LB. FT. | |
| 14MM | 26-30 LB. FT. | |
| 18MM | 32-38 LB. FT. |
What are the symptoms of spark plugs not tight enough?
The loose spark plug may also blow out of the spark plug hole, causing damage to the engine’s cylinder head. Performance problems, such as misfiring and an illuminated check engine light, can also result.
How tight should Subaru spark plugs be?
Spark plugs do not need to be tightened much! My suggestion is to spin them as tight as they will go by hand, and then just a little bit more with a ratchet. Less is more! If you purchase NGK spark plugs, on the box it will instruct you to go 1/4 turn past finger tight.
Can you torque spark plugs without torque wrench?
If your using plugs without a gasket ring (the shamfered type) then hand tight plus a quarter turn – no more. If it does have the gasket ring (looks like a metal washer) and the plugs are new then hand tight plus half a turn. If the plugs are old then hand tight plus a quarter turn.
What torque wrench do I need for spark plugs?
If you want a halfway accurate torque wrench for low specs then you need a 3/8 or 1/4 drive. My opinion is that 1/2 drive torque wrenches are a bit iffy at specs that low. Personally, I do not use a torque wrench on plugs and trust feel more than a spec that may cause more trouble than any help it offers.
How do you tighten a spark plug gap?
And you go on top of this and you gently push down. And then you test. It. Okay so now it’s like 0.055. So I have to push down a little bit harder. See where it is. Now.
Should spark plugs only be hand tight?
If your using plugs without a gasket ring (the shamfered type) then hand tight plus a quarter turn – no more. If it does have the gasket ring (looks like a metal washer) and the plugs are new then hand tight plus half a turn. If the plugs are old then hand tight plus a quarter turn.
What is the torque spec for spark plugs?
Torque Specs:
| Spark Plug Type | Thread Diameter | Aluminum Cylinder Head (lb-ft.) |
|---|---|---|
| Flat seat type (with gasket) | 12 ø mm | 10.8 ~ 14.5 |
| Flat seat type (with gasket) | 10 ø mm | 7.2 ~ 8.7 |
| Flat seat type (with gasket) | 8 ø mm | 5.8 ~ 7.2 |
| Conical seat type (without gasket) | 18 ø mm | 14.5 ~ 21.6 |
Should you put anti seize on spark plugs?
Thread breakage can sometimes involve removing the cylinder head for repair. Metal shell stretch changes the heat rating of the spark plug and can result in serious engine damage caused by pre-ignition. Do not use anti-seize or lubricant on NGK spark plugs. It is completely unnecessary and can be detrimental.
