The original equipment gaskets have a plastic carrier and soft sealing beads around the coolant and intake ports. Some have blamed the problem on GM’s Dex-Cool antifreeze, but the real problem has been the intake manifold gaskets.
This is the most common problem on these engines. This particular casting tended to develop cracks near the center cylinders.Īpplications for the 3.1L engine have included:ġ988-1991 Pontiac 6000 (STE & LE, but primarily for STE) The only “problem” block in the 3.1L V6 engine family to watch out for was the one used in some 1988-’90 FWD cars and minivans, casting #10065459. Early versions of the RWD engine and FWD minivans used a distributor ignition system while all of the FWD car applications had waste-spark distributorless ignition systems. The 1988-’92 engines did not use a cam position sensor, some of the 1993-’94 engines had cam sensors and some did not, while all of the 1995 and later engines had cam sensors. The major differences to watch out for would be the A/C compressor and starter mounting bolt holes, and sensor mountings. If you’re swapping in a used engine for a customer, interchangeability will depend on the make and model year. Roller rockers were also used on most 1995-’99 3.1L engines.
#Gm 3.1 timing cover gasket replacement code#
The Gen III version of the engine (L82 built from 1993 to 1999, and the later LG8 VIN code J engines) added a composite roller cam and used a number of slightly different cylinder heads. Some of the engines (notably 1990-’95 FWD minivans) had cast iron heads, while most of the later engines came with aluminum heads. A real cream puff low-mileage mint condition car might fetch a couple thousand dollars on a used car lot. Most of these vehicles have aged to the point where they don’t have much resale or trade-in value. The narrow 60° angle of the V6 cylinder banks was chosen so the engine would more easily fit into front-wheel drive cars and minivans (though it has also been used in rear-wheel drive applications, too). By simply changing the bore diameter, the displacement of the same engine block could now be increased for more power and torque. Over the years, GM has saved a bundle on manufacturing the 3.1L engine by using the production line tooling it originally developed for the 2.8L V6.
The larger 3.4L version has been imported into the U.S. Today, the 3.1L lives on in China where it is being made in various displacements (2.5L, 3.1L and 3.4L) for GM’s Chinese-built Buicks. The 3.1L was eventually replaced with various versions of the 3.4L V6. The engine itself was based on the earlier 2.8L V6 that was first produced back in 1980.
#Gm 3.1 timing cover gasket replacement plus#
The engine itself went through continual evolution and improvement during its production life, including Gen II and Gen III versions, plus an “Enhanced 3100” version from 1999 to 2001. Over 10 million of these engines were built during this period.
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