SW1 L4-1.9L SOHC VIN 8 (1996)
Valve Guide: Technical Service Bulletins
Tools - Required for Valve Guide Inspection
BULLETIN NO.: 98-T-50
ISSUE DATE: December, 1998
GROUP/SEQ. NO.: Engine-09
CORPORATION NO.: 886106
SUBJECT:
Service Information on New Special Tools (Go/No-Go Gauges P/Ns J43120 and J43481) that are Required for Cylinder Head Valve Guide Inspection
MODELS AFFECTED:
1991 - 1999 Saturn vehicles
PURPOSE:
This bulletin provides technical information regarding new special tools, Go/No-Go gauges P/Ns J4312O and J43481, that are required for cylinder head
valve guide inspection.
APPLICATIONS:
J43120
(7 mm)
1991-1999 1.9L SOHC Engines
1991-1998 1.9L DOHC Engines
J43481
(6 mm)
1999 1.9L DOHC Engines
DIAMETER
Go (Green)
No-Go (Red)
SPECIFICATIONS:
J4312O
6.987 mm (+/- .001 mm)
7.050 mm (+/- .001 mm)
J43481
6.000 mm (+/- .001 mm)
6.060 mm (+/- .001 mm)
TOOL CARE:
Saturn Valve Guide Go/No-Go Gauges (P/Ns J4312O and J43481) are precision tools that allow technicians to quickly and accurately measure cylinder
head valve guide bores for proper diameter, roundness, and straightness. This type of tool is commonly used in manufacturing for qualifying bores,
sleeves, guides, etc. Precision tools must be used and handled with care. Do not drop, bend, score, scratch, or otherwise damage the gauge measuring
pins or holder. Store the tools in a safe and secure location when not in use as described in the letter which accompanied the 7 mm tool in a previous
mailing. Also, lightly coat the gauge measuring pins with oil or silicone lubricant to inhibit corrosion when in storage. If surface corrosion occurs, clean
the pins with fine steel wool.
PROCEDURE:
1.
With cylinder head removed from engine and valve removed from guide, thoroughly clean the valve guide using a drill driven guide brush and
solvent.
NOTICE:
The Go (Green) end of the gauge should go through the entire length of the guide with light and uniform pressure. Use of excessive force will result
in tool damage.
2.
Insert the Go (Green) end of the appropriate gauge (P/N J43120 or J43481) into the guide from either the combustion chamber side or the
camshaft side:
^
If the gauge passes through the guide with light and uniform pressure, proceed to step 3.
^
If the gauge will not pass through the guide with light and uniform force, clean the guide again as in step 1 and repeat the guide measurement.
If the gauge still will not pass through the guide with light and uniform pressure, refer to the appropriate model year Engine/Fuel/Air
Intake/Exhaust service manual for valve guide repair and/or replacement procedures.
NOTICE:
The No-Go (Red) end of the gauge should NOT enter either end of the guide. Use of excessive force will result in tool damage.
3.
Attempt to insert the No-Go (Red) end of the gauge into both ends of the valve guide:
