Trans Sport V6-3800 3.8L (1994)
Technical Service Bulletin # 576117
Date: 950601
Piston Specifications - Revised
FILE IN SECTION: 6 - Engine
BULLETIN NO.: 57-61-17
DATE: June, 1995
SUBJECT:
Section 6A - Revised Piston Specifications
MODELS:
1988-90 Buick Electra
1988-91 Buick Reatta
1988-93 Buick Riviera
1988-94 Buick LeSabre, Park Avenue
1990-94 Buick Regal
1992-94 Chevrolet Lumina APV
1988-92 Oldsmobile Toronado, Trofeo
1988-94 Oldsmobile Eighty Eight, Ninety Eight
1992-94 Oldsmobile Silhouette
1988-94 Pontiac Bonneville
1992-94 Pontiac Trans Sport
with 3800 Engine (VINs C, L, 1 - RPOs LN3, L27, L67)
The piston specifications for the 3800 engine from 1988-94 have been revised. This information should replace the piston specifications found in the
applicable Service Manual. Use the following specifications when servicing of the piston is required.
1988 - 1992 (LN3 and L27) Piston Specifications
PISTON
Piston
Clearance (44 mm from top of piston) ................................................................................................................. 0.010-0.056 mm (0.0004-0.0022 in.)
PISTON RINGS
Ring Groove Depth
Top Compression .......................................................................................................................................................... 4.389-4.519 mm (0.173-0.178 in.)
2nd Compression .......................................................................................................................................................... 4.389-4.519 mm (0.173-0.178 in.)
Oil Control .................................................................................................................................................................... 4.204-4.334 mm (0.165-0.171 in.)
End Gap
Top Compression .......................................................................................................................................................... 0.305-0.559 mm (0.012-0.022 in.)
2nd Compression .......................................................................................................................................................... 0.254-0.635 mm (0.010-0.025 in.)
Oil Control .................................................................................................................................................................... 0.381-1.397 mm (0.015-0.055 in.)
Side Clearance
Top Compression ...................................................................................................................................................... 0.033-0.079 mm (0.0013-0.0031 in.)
2nd Compression ...................................................................................................................................................... 0.033-0.079 mm (0.0013-0.0031 in.)
Oil Control ................................................................................................................................................................ 0.028-0.206 mm (0.0011-0.0081 in.)
Ring Width
Top Compression ...................................................................................................................................................... 1.476-1.497 mm (0.0581-0.0589 in.)
2nd Compression ...................................................................................................................................................... 1.476-1.497 mm (0.0581-0.0589 in.)
Oil Control ................................................................................................................................................................ 2.850-3.002 mm (0.1122-0.1182 in.)
PISTON PIN
Diameter ........................................................................................................................................................... 22.995-23.000 mm (0.90531-0.90551 in.)
Fit in Piston ............................................................................................................................................................... 0.010-0.020 mm (0.0004-0.0008 in.)
Fit in Rod (clearance) ................................................................................................................................................. 0.018-0.043 mm (0.0007-0.0017 in.
1993 - 1994 (L27) Piston Specifications
PISTON
Piston
Clearance (44 mm from top of piston) ................................................................................................................ 0.010-0.056 mm (0.0004-0.0022 in.)
