This engine uses hydraulic vlave followers, there is no adjustment.
SOURCE: Mazda pick up B 2900 valves clearance
THIS IS FOR A B3000 SERIES.
The manufacturer indicates that this vehicle has hydraulic lifters or adjusters and therefore does not require adjustment.
THIS IS FOR THE B2300 SERIES.
Midrange clearance is the most desirable:
Intake
0.22 - 0.28 mm (0.008 - 0.011 inch)
Exhaust
0.27 - 0.33 mm (0.010 - 0.013 inch)
"COULDN'T FIND B2900 SERIES"
SOURCE: valve clearance
tappets dont squeak .. you want to hope the noise is coming from an ageing or loose fan belt .. if it is really coming from inside the valve cover then it could be a blocked oil passage that lubs the cam and its bearings ..this would soon cause a major engine failure .. other possibilities .. a bad bearing in the idler pully, water pump or alternator (a drop of oil on those can help identify the failing bearing) ... also at times the distributor can cause noise if its bearings run dry .. there is a really neat stethoscope like tool that allows you to listen to various parts and places to locat the problem .. but be careful playing around a running engine (no ties, long hair, necklaces .. if its the fan belt then it will likely make more noise as the engine is accelerating .. turning the lights on might increase or change the noise .. a leaky vacuum hose can cause a whistle like sound. .
SOURCE: Need fuse diagram for mazda b2500
go to the link below and choose the 1998 ford ranger as the truck, they are the same, then follow the link to ford site and download the 1998 ranger owners manual, the fuse diagrams are in there
http://www.edmunds.com/ownership/howto/articles/120189/article.html
SOURCE: i need location on idle control valve on 2000
side of the throttle body, here is a picture of the valve,
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