Engine damage from intake manifold alignment pin entering engine cylinder. The upper and lower intake manifolds, and gasket are aligned using two steel dowel pins -A- in positions shown. If care is not taken to ensure these pins are in place when removing and installing the upper intake manifold, the alignment pin(s) may fall (unnoticed) into lower intake manifold. If the engine is started, the pin may then fall into a cylinder and will cause severe damage to the engine.
Whenever repairs require separation of the upper intake manifold from the lower intake manifold:
• ALWAYS ensure that the alignment pins are located in the proper position.
If one or both pins are not in the proper position:
• Locate the missing pin(s) (which may have fallen into the lower intake manifold).
• Reinstall the locating pins in the proper position prior to reassembling the intake manifolds.
Some or all of this information was provided by the Automotive
Parts Remanufacturers Association (APRA). For more information on
technical bulletins available through APRA call 703-968-2772 or visit www.AutoBulletins.com.