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Sealant

Several types of sealant and locking liquid are used on the engines. The properties of the sealants differ as they are intended for different strengths of fasten- ings, temperature, resistance to oil and other chemi- cals, and also for different materials and gap thick- nesses found in the engine.

To ensure service work is correctly carried out it is im- portant that the correct sealant and locking fluid type is used on the joint where the agents are required.

In this Volvo Penta Workshop Manual the user will find that each section where these agents are applied in production states which type was used on the en- gine.

For service work, an similar product from the same manufacturer, or corresponding product with the same characteristics from another manufacturer, can be used.

When using sealants and locking fluids, make sure that mating surfaces are dry and free from oil, grease, paint, anti-corrosion agent and old sealant. Always fol- low the manufacturer’s instructions for use regarding temperature range, curing time and any other instruc- tions for the product

Two different basic types of agent are used on the en- gine. These are:

1. RTV agent (Room Temperature Vulcanizing). Used for gaskets, sealing gasket joints or coating gaskets. RTV is visible when a part has been disassembled; old RTV must be removed before resealing the joint.

The following agents are of RTV-type: Loctite® 574, Volvo Penta 840879-1, Permatex® No. 3, Volvo Pen- ta 1161099-5, Permatex® No 77. Old sealant can be removed using denatured alcohol in all cases.

2. Anaerobic agents. These agents cure in the absence of air. These agents are used when two solid components, i.e. cast components, are fitted together without a gasket. Common uses are also to lock and seal plugs, stud threads, taps, oil pressure monitors etc. Hardened anaerobic preparations are glassy and for this reason, the preparations are colored to make them visible. Cured anaerobic agents are extremely resistant to solvents and the old agent cannot be re- moved. When reinstalling the part, degrease it careful- ly and then apply new sealant.

The following agents are anaerobic: Loctite® 572 (white), Loctite® 241 (blue).

Notice: Loctite® is a registered trademark for the Loctite Corpo- ration.

Permatex® is a registered trademark for the Permatex Corpora- tion.

Group 23 EMS 2 General


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