BEFORE YOUR HEAD GOES ON THE BLOCK viii - AA Gaskets

BEFORE your HEAD. goes ON THE OVERHEATING HARDNESS. Most modern engines operate within a temperature range Checking for hardness requires a hardness tester. of approximately 88 to 105 Celsius (190 to 220 While this in itself is not overly expensive or complicate Fahrenheit). If an engine exceeds its normal operating it is often difficult to obtain a specification as to what range and overheats the elevated temperatures can cause the allowable hardness figure should be. Each engine extreme stress in the cylinder head. This particularly true manufacturers has their own blend of aluminium alloys of bi-metal engines where the difference in the thermal with the mix trace elements used differing slightly from expansion rate of the aluminium cylinder head is two to manufacturer to the next. Some further complicate this three times that of the cast iron BLOCK . It is important to by using a number of different alloys within their range note at this time that a water temperature gauge only of engines the specific alloy used for a Nissan CA20.

BEFORE YOUR HEAD GOES ON THE BLOCK... viii. CLEANLINESS. Prior to assembly a final check of all components should be made paying particular ... engines whether of aluminium or cast iron construction however due to the rapid changes in technology always check the …

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