6/1/2002
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Replace a piston oil jet on a 1995 Mazda 2.0L FS engine
Q. How do I replace a piston oil jet on a 1995 Mazda 2.0L FS engine?
A. The following information should be used when removing and installing oil jets in 1993-’99 Mazda 2.0L FS engines. Correct procedures are necessary to ensure that each piston receives ample oil to cool the piston crown.
Follow the procedures listed below to remove and install the nozzle.
- Drill a hole into the center of the oil jet head with a 7 mm (0.28˝) drill bit as shown in Figure 1.
- Remove the spring and ball through the hole.
- Tap the hole with a M8 x 1.25 tap to 8 mm (0.31˝) deep.
- Screw a M8 x 1.25 bolt into the tapped hole.
- Attach the slide hammer to the bolt. CAUTION: Twisting or turning the sliding hammer while removing the oil jet can damage the cylinder block.
- Pull the slide hammer straight upward and discard the used oil jet.
- Temporarily install the crankshaft, connecting rod, and piston in the cleaned cylinder block.
- Coat the new oil jet (p/n FS0110580A), align the nozzle with the piston’s notch and fit the oil into the hole, aligning the nozzle with the piston’s notch.
- Put the cylinder block on the press stand.
- Verify that the new oil jet nozzle is properly aligned. CAUTION: If the oil jet nozzle is not properly aligned after being pressed in, cylinder block and piston can fail.
- Press-fit the new oil jet into the cylinder block to a depth of .410-.440˝ (10.5-11.0 mm) using a pressure of 726 psi minimum (3.2 kN minimum) as shown in Figure 2.
- CAUTION: Depth over specification can damage the oil jet nozzle. Pressure below specification indicates loose fit. If that occurs, replace the cylinder block and oil jet.
Q. How many different styles of rod bolts were used in Volvo 3.0L engines?
A. The AERA Technical Committee offers the following information regarding connecting rod bolts for 1992-’99 Volvo 3.0L engines. In 1998, Volvo introduced a revised rod bolt with a different thread pitch.
These bolts are very similar and offer little means of visual identification. The revised bolt has a different thread size. During the 1997 production year both bolt designs were used. It is important to note that either design may be used but one design should be used within one engine. The following information can be used to identify bolt types.
- Older bolts from the factory have M9 x 1.25 mm threads and have no markings on the bolt head. Replacement parts (p/n 1271900-1) have a circular stamp in the bolt head as shown in Figure 3.
- Replacement bolts in production engines from the factory have M9 x 1.0 mm threads and have no markings on the head. New replacement parts (p/n 9125471-4) have a triangular stamp in the head as shown.
A thread gauge should be used to check which type of bolt is used, because no markings were used on production bolts. Volvo offers thread gauge M9 x 1.0 mm (p/n 1158902-5) and thread gauge M9 x 1.25 mm (p/n 1158901-7).
Note: Some service information references this engine as a 2.9L displacement.
Q. What’s the best way to correctly identify GM marine and industrial engines?
A. The AERA Technical Committee offers the following information for marine and industrial engine identification for GM 3.0L engines built from 1979-2000 If the wrong parts are ordered, engine performance or damage may result.
These engines have the identification stamping codes located on the cylinder block, at the machined surface next to the distributor assembly surface. To understand what the stamping identification code means, follow the example code listed above right.
The two letters corresponding with the engine code (RN in this specific example), match with the engine part number and only with it for a specific model year. Different model years will use the same engine code until the engine incorporates a major design change.