Head gasket selection for Toro Groundmaster and Roadmaster units with 1982-'99 Peugeot XUD9 diesel engines - Engine Builder Magazine

Main Navigation

Advertisement
Social Connect
Resources
Our Brand Family
Engine Builder Magazine
Content for engine professionals and enthusiasts
Tech Center

Head gasket selection for Toro Groundmaster and Roadmaster units with 1982-’99 Peugeot XUD9 diesel engines

Engine Builder
By Engine Builder

Engine Builders: The AERA Technical Committee offers the following information for head gasket selection for Toro Groundmaster and Roadmaster units with 1982-’99 Peugeot XUD9 diesel engines. This information should be considered any time the head gasket is replaced.

Related Articles


Four different head gasket thickness options are currently available and provide a variety of gasket thickness options to choose from. Selecting a replacement head gasket requires measuring the amount of piston protrusion above the deck of the block. After determining the piston height, select the appropriate replacement gasket from the chart below. The gaskets are further identified by a different number of notches on the end of each gasket.

NOTE: The charts in the original service manuals are no longer valid.

Engine Builders: The AERA Technical Committee offers the following information on swirl chamber replacement on Volkswagen 1.9L diesel VIN AAZ 1993-1998 cylinder heads.

When installing a MLS head gasket on an engine that had used a composite gasket, correct protrusion of the precombustion chambers (precups) is critical to obtaining a proper head gasket seal. If the precups are recessed below the head surface they must be removed and replaced. Correct protrusion may also be obtained by machining the counterbores to the correct depth after the head surface has been machined.

To correctly change the swirl chamber, Volkswagen offers the following recommendations.

  1. Drive out the swirl chamber by working through the fuel injector opening using a suitable mandrel. CAUTION: protect the threads in the fuel injector opening from damage.

  2. Clean swirl chamber contact surface in cylinder head to remove combustion deposits. Installation position is determined by groove and guide tabs.

  3. Place new swirl chamber in position and drive in with a soft-faced hammer. Measure the protrusion of the swirl chamber; .0028? is maximum allowed (see Figure 2, above).

    NOTE: A .001?-.002? protrusion is ideal, however, precup bore clearance is not as critical.

For information on receiving all of AERA’s regular monthly technical bulletins and other association services and benefits, call toll free 888-326-2372 or e-mail [email protected]

You May Also Like

Engine Components

LTR Engine Build

This Late Model Engines build is centered around Concept Performance’s new LTR block, which is the first aftermarket as-cast aluminum Gen V LT block. 

Evan Laux
By Evan Laux

The Chevrolet LT engine family from General Motors is rooted in the early ‘70s, when the LT1 was featured in the Corvette and Camaro Z28. After a 20-year hiatus, GM reintroduced the platform in the early ‘90s. The “LT1 350” came out in 1991, and was distinct from the high-output Gen I LT1 of the 1970s. It displaced 5.7L (350 cu in), and was a two-valve per cylinder pushrod design. The LT1 used a reverse-flow cooling system, which cooled the cylinder heads first, maintaining lower combustion chamber temperatures and allowing the engine to run at a higher compression than its immediate predecessors.

Read Full Article

More Tech Center Posts
LS Intake Manifolds

LS swaps are popular for many reasons, but there are a lot of variations and details to sort through – more of them than you may expect – and many of them are associated with the intake manifold.

By Eric Garbe
LS Cylinder Heads

The LS engine is known for its cylinder heads, and there are tons of options available to upgrade the factory components.

By Evan Laux
Choosing the Correct Block for Your LS Engine Build

Whether you’re scouring junkyards, ordering cores, investigating factory options, looking at aftermarket cast iron or aluminum blocks, or spending big bucks on billet LS blocks, you’ve probably noticed it’s been harder to find exactly what you want for the foundation of your LS build than it historically has.

By Greg Jones
Open Loop/Closed Loop and Learning

Closed-loop control can be programmed to either add or subtract up to a certain percentage of fuel in order for the engine to reach the target air/fuel ratio.

By Andrew Starr

Other Posts

Shop Solutions January 2023

Next time you have set of large journal small block Chevy connecting rods to resize, consider honing the big ends of them for a +.002” outside diameter bearing that the LS engines with fracture cap rods use.

By Shop Solutions – The Power of Knowledge
Shop Solutions December 2022

Everyone misses occasionally, and this helps avoid dents and damage.

By Shop Solutions – The Power of Knowledge
Jesel Certified Performance Rebuilds

Engine components are serious investments for any racer and maintaining that investment could be the difference between winning a championship and losing it.

By Engine Builder
Going the Extra Mile with Cylinder Head Porting

It’s not just the port work alone that creates spectacular cylinder head performance. The most critical areas of a cylinder head are those which pass the most air at the highest speed and for the longest duration. Your bowl area, the valve job, the throat diameter, and combustion chamber are all crucial parts. 

By Greg Jones