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Linkages and Vacuum lines
Intake Manifold Bolts
Gasket Comparison
Gasket Sealants
Shared Gaskets
Engine Coolant
Thermostat Vent Holes
Cooling System Air Bleeds
Select a part to view solution for common problems associated with the item.
Advice: Plastic wiring harness clips and vacuum hose connections can become brittle and easy to break, use caution, some of the biggest headaches in a job are self imposed. Before dismantling, it's a good idea to mark key components and the place that they belong with colored or numbered pieces of masking tape. A Polaroid or digital camera is a good tool to refresh your memory with, take a few shots from different angles and use them to refer to later. Recommendations: Masking Tape
Operation: The intake manifold bolts are responsible for maintaining the pressure needed to seal the intake manifold to the cylinder head. Advice: Intake manifold bolts are not always the same length, take notes as to where the longer and shorter bolts were originally installed for later referral. Intake manifold bolts are designed to be tightened and loosened slowly and systematically in a specified pattern that maintains equal pressure on the sealing area at all times. Unequal pressure can lead to intake manifold damage and broken bolts. Check the repair guides for the correct torque specs and tightening sequence. Recommendations: Repair guides
Advice: Before installing the new intake manifold gaskets it is very important to compare the new gaskets with the old ones. All engine oil and coolant passages must align correctly with the gasket for proper sealing of the intake manifold to the cylinder head.
Operation: Gasket sealant is used to fill in the small imperfections in the gasket material and the sealing surfaces to be joined. Advice: Before deciding on which type gasket sealant that you need, take a good look at the gaskets that you are replacing. Many gaskets now come with a bead of sealant already applied. If the engine you are working on is computer controlled, make sure that any sealant you buy is safe for oxygen sensors. For paper and fibrous gaskets, a thin coat of sealant on both sides of the gasket is sufficient. Unless otherwise noted, there is no need to use gasket sealant on rubber gaskets. Recommendations: Gasket sealant
Advice: When the intake and exhaust manifolds are located on the same side of the head, they often share a gasket, or their gaskets are joined together to ease the assembly process. This style of intake/exhaust manifold setup will usually have several bolts that pull down on both manifolds at the same time. These bolts will often have a large flat or convex washer to distribute the load evenly across both manifolds. Ensure that these washers are properly in place and not cocked to one side before tightening the bolts. Always tighten the bolts to specifications in small increments following the correct tightening sequence found in the repair guides.
Operation: Engine coolant is a 50/50 mixture of antifreeze and water. Besides protecting against freezing, antifreeze also has lubricant and anticorrosive additives that help to prolong the life of the cooling system components. Advice: Any muddiness or brown coloration is an indication of dirt or rust in the system. As antifreeze ages the lubricants and anticorrosive properties wear out, leaving the system susceptible to corrosion. Modern antifreezes have varying life span expectancies. If you are unsure how long your antifreeze is good for, a general rule of thumb is to flush the system and refill with fresh coolant every two years. Some manufacturers recommend a specific type of antifreeze, such as GM's Dex-cool. Check the repair guides for the vehicle that you are working on. Recommendations: Repair guides Antifreeze
Advice: Some engine designs require that the thermostat be installed with the vent or bypass hole in a certain position. Failure to position the thermostat properly can cause engine overheating. Check the repair guides for the vehicle you are working on. Recommendations: Repair guides
Operation: Air pockets trapped in the cooling system can cause the engine to overheat. Some cooling systems have air bleed valves built into the system to aid in the removal of air pockets. Advice: For many cooling systems, the method of removing air pockets is to start the engine and allow it to run with the radiator cap off or loose until all the air escapes from the neck of the radiator. For some systems this method is not sufficient, and the manufacturer has installed air bleed valves usually near or on the thermostat housing. Consult the repair guides for the vehicle you are working on. Recommendations: Repair guides
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