Believe it or not by the time you pay for the heads and to have the cylinder block resurfaced and heads installed it is actually cheaper to purchase a remanufactured engine or purchase a used engine from a salvage yard. For a 1995 anything I'd be a little leery of buying a used one in a salvage yard though. Ask you mechanic to give you a quote for both and then ask another mechanic so you know you are being quoted a fair price.
yes heads need to be removed
its just above the transmission in between the cylinder heads
You have to remove the engine cylinder heads to get to the lifters on the 5.3.
You can adjust the camshaft on your 1997 Mazda 626 with the camshaft adjustment bolts. You can access the camshaft adjustment bolts by removing the cylinder heads.
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Remove carburator then intake manifold then cylinder heads
If the heads, cam, crank, and block is good then you are looking at about 1500 professional and 700 do it yourself
Cylinder heads can be bought in bulk from Sportflo in South Africa or try American Cylinder heads if based in the US. For other buyers try Bridge Cylinder Heads in Cheshire, UK.
If the only thing wrong with the engine is the cylinder heads, yes you should replace just them, Getting a rebuilt motor is expensive and not needed unless the motor has been damaged beyond repair.
It is difficult, the cylinder heads need removed.
Both the four cylinder and six cylinder engines are non-interference so if the timing belt breaks there will be no damage to the valves. The 1993-2001 four cylinder engines all use the same block and heads as do the six cylinder engines.
The lifters are in the cylinder heads.The lifters are in the cylinder heads.