YSTOOL 8PCS Engine Compression Tester Kit Automotive 300PSI Cylinder Pressure Test Gauge Tool Set for Auto Car Truck Motorcycle Gasoline Petrol Gas Engine Diagnostic with Red Case

Price: $17.99
(as of Apr 04,2022 14:07:44 UTC – Details)

Product Description

YSTOOL 8PCS Engine Compression Tester Kit tests engine cylinder pressure from 0 to 300PSI on popular size spark plug ports and determines engine mechanical condition.

Perfectly for almost all petrol/gas engines: cars, motorcycles, trucks, chainsaws, lawn mowers, boat motors and other 2 or 4 stroke, single or multi-cylinder gasoline engines.

Package List

1x 300PSI / 20bar pressure gauge with quick coupler

1x 6″ long straight push-on connector

1x 6″ long curved push-on connector

1x 16″ rubber resin hose with 14mm adapter

1x 10mm x 1.0 adapter

1x 12mm x 1.25 adapter

1x 14mm x 1.25 adapter

1x 18mm x 1.5 adapter

1x Instruction

1x Red case

Compression gauge

For a quick and accurate compression check on gasoline engines

Help locate the source of the problem

Test range: 0-300PSI / 0-20bar

3″ gauge, rubber cover, equipped with quick coupler

Push-on Connectors

Straight one and curved one. Came with quick plug

Aluminium stem and rubber cone tip for universal use

Rubber Resin Hose

Length: 16″

With a 14mm brass connector for 10mm 12mm 14mm 18mm brass adapters

Brass Adapters

10mm 12mm 14mm 18mm

Popular sizes for more makers

Wide Application

This kit allows you to test compression from lawn mowers to trucks with gasoline engine. Not for most diesel engine, because of the low pressure gauge range 0-300PSI, which is much lower than most diesel engine compression

Easy Usage

1.Run the engine to the normal operating temperature. Stop the engine, unload spark plug wires. Clean all spark plug wells if necessary.

2.Remove the spark plugs and the air filter, set the throttle wide open position. Disconnect the ignition system. Press the compression tester push-on connector, or connect the right thread adapter to the hose and screw it into the spark plug hole(Hand tighten only, DO NOT tighten too much with a wrench). Connect the coupling on the gauge to the push-on connector or the hose. Make sure all connections are fully engaged.

3.Crank the engine for at least 5 compression strokes. Wait for the pressure reading on the gauge stops at a certain value. Record the compression reading and then press the button（release valve）to relieve the pressure.

4.Repeat the above procedures, each cylinder measures 2 to 3 times to ensure the measurement accuracy. The removed components should be put back in place after the operation, especially before engine running.

5.Note to return the throttle plates to the closed position and reconnect the ignition system wiring.

Safety Tips

1.Do not use equipment if damaged

2.Wear eye protection. Do not wear jewellery and tie back long hair

3.Tidy up all used tools and equipment and never leave them in, on or near engine

4.When not in use, place in protective case and store in a safe, dry and childproof place

5.Ensure that the adaptor is securely fastened to the hose to prevent possible separation when the adaptor is removed from the cylinder head

Test Results

On a normal cylinder, the gauge needle should travel up the scale on each compression stroke until it reaches peak value. Compression gauge reading should not vary by more than 10% from cylinder to cylinder.

A variation in compression readings between cylinders is often a better indication of engine problems than the absolute values of compression

1.If the gauge needle does not travel up the scale or if it remains at the same value for several strokes and then climb, the problem could be a valve sticking
2.If the compression reading exceeds the manufacturer’s specification, the problem may be carbon built-up in the cylinder. It may also indicate that either the piston, or the cylinder head, has been modified.
3.If a reading on two adjacent cylinders is 20psi(or more) lower than the other cylinders, the problem may be a cracked cylinder head or defective main gasket. Under these conditions, both coolant and oil may be found in both cylinders.
4.If the readings are low, or vary widely between cylinders, pour a teaspoon of SAE 30 oil into each cylinder and retest them. If the readings increase considerably, the problem may be poorly seated, or worn, piston rings. If the readings remain about the same, the valves and/or associated components may be the problem. A burned or damaged piston may also cause the same results

Package Dimensions ‏ : ‎ 11.34 x 8.7 x 2.64 inches; 2.25 Pounds
Date First Available ‏ : ‎ June 18, 2020
Manufacturer ‏ : ‎ YSTOOL
ASIN ‏ : ‎ B08BFVSGMS

This cylinder compression tester kit is a professional tool to test the compression in gasoline engine. The readings will help to diagnosis if there are valve sticking, carbon build-up, piston or cylinder head modified, cracked cylinder head or defective main gasket, poorly seated or worn piston rings, etc. Please note, a variation in compression readings between cylinders is often a better indication of engine problems than the absolute values of compression
There are 4 sizes of brass adapters and 2PCS universal push-on connectors in the engine pressure tester kit. The 10mm 12mm 14mm 18mm adapters can be connected to the corresponding size cylinder head. The straight push-on connector and the curved one use rubber cone tip, can be pushed against on the cylinder head, universal for almost all the size cylinder head
The engine cylinder compression test tool kit can be widely used for most type and depth spark plug well. If you have motorcycle car truck ATV mower and any other vehicles with gasoline or gas engine, and you are a professional on repairing vehicles, you can try this kit. Please note, this cylinder compression test gauge is not suitable for most diesel engine, because the range of the gauge is only 0-300PSI, which is much lower than most diesel engine compression.
The pressure gauge is equipped with 3″ big dial, protected by rubber cover. It has pressure holding function, please press the pressure release valve before disconnect. After insert the hose and push-on connectors into the quick coupler on the bottom, remember to push the knurled grip ring on the quick coupler back to lock. The 16″ long rubber resin hose, is equipped with a 14mm brass adapter, can be connected to 10mm 12mm 14mm 18mm adapters directly.
Set the throttle plates to the wide open position when test, and after test restore it to closed position before starting the engine, otherwise, a serious damage will be caused on the engine if failure to close the throttle plates. We supply 1 year warranty, please feel free to purchase. Please contact us by Amazon message system if there is any question, we will reply in 24 hours.