What does it mean when your valve guide is worn?
Valve guide wear refers to excessive clearance between valve stem and valve guide. As valve guides wear, the side to side movement can cause valves to seat improperly. Valve leakage causing compression loss is another reason for engine issues.
Why are the valve clearances on my car worn out?
Contrary to the valve clearance, a lot of wear does not make itself heard, but is betrayed by a deteriorating engine performance or a higher oil consumption. However, these can be the result of other engine trouble as well and therefore an exact diagnosis of the malfunction and its causes is necessary.
How do you check the valves on a 4 cylinder car?
For example, on a four-cylinder engine when the rockers on No. 1 are rocking you can check both valves on No. 4. Turn the engine in its normal direction of rotation by using a spanner or socket wrench on the crankshaft-pulley bolt until the two chosen rockers rock. Leave the feeler gauge in place whilst you adjust.
Where do you check the clearance of a valve on an OHC engine?
On an OHC engine with bucket tappets, measure between the tappet and the bottom of the cam lobe. On overhead-camshaft engines, check the clearance of each valve when the lobe of its cam is pointing directly away from it.
How do you clear codes-maintenance / repairs / repairs?
(Same thing as a Mercury Villager) Was an O2 sensor code. Turned out the sensor itself was OK; there was just a broken wire coming out of the O2 sensor. I mended the wire and then disconnected the battery for a minute. Reconnected the battery. Started engine. Check engine light came on and stayed on. Disconnected battery for 10 minutes.
How do you clear code on your car?
A friend told me that you could just disconect your car battery for about 10 minutes and that would clear it out, another said cars built after 1995 wouldn’t do it and they have to be removed via a computer. You might try the auto parts store. Advance or autozone. They have an OBD device to plug into the car to clear the codes. Really?
What does the Diagnostic Code on the Check Engine light mean?
A specific diagnostic code indicates which sensor reported the problem. These codes are known as the OBD-I and OBD-II codes, but more on that in a moment. Your car has sensors for many components. Most are related to emissions control (see below for more about the tire pressure warning light on newer cars).
Where can I find the trouble code on my car?
You can read your car’s diagnostic trouble codes yourself with a low-cost Diagnostic Code Scanner that plugs in under the dash to access the car’s computer.
Valve guide wear refers to excessive clearance between valve stem and valve guide. As valve guides wear, the side to side movement can cause valves to seat improperly. Valve leakage causing compression loss is another reason for engine issues.
What should intake valve stem to guide clearance be?
Intake valve stem-to guide clearance for most passenger cars ranges from .001 to .003 in. Because of extra heat exhaust will be .002 to .004 in. Diesel engines as a rule have looser specs on both intake and exhaust guides than gasoline engines.
What should intake and exhaust valve guides be?
Intake valve stem-to guide clearance for most passenger cars ranges from .001 to .003 in. Because, of extra heat, the exhaust, will be .002 to .004 in. Diesel engines as a rule, have looser specs on both intake and exhaust guides than gasoline engines.
What kind of metal is a valve guide made of?
A valve guide is a narrow tubular piece of metal that can be made from cast iron, Bronze or other composite alloys. On certain engines, these guides can crack if there is a timing failure. This is more common with cast iron guides. Guides can come with different designs, some have circlips, recesses, grooves, protrusions & tapers.