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Definitely non interference head (assuming not crazy modified) so won't bend a valve if it throws the timing belt.

If it were just a bent valve its repairable and you certainly do not need to spend $5K. If the car has done 100K its probably got lots of life left in it. This is not a big job for a good mechanic. If the timing belt has broken etc its easy to tell with the cam cover removed. If its come up to 100K and it has broken you are going to need to replace belt and usual is also the water pump.

Find another garage. Everything he said is wrong, especially including the price.

Typically you'd remove the head, send it to a machine/reconditioning shop to get it checked and fixed. 4 hours to remove and refit plus whatever the machine shop needs to do, up to around $500. Factor in another $500 for gasket set, belt and water pump. Otherwise you can search for a replacement NA8 engine, and that'd be under $1,000 plus fitting and you could sell a fair bit of the old engine here.

Alternatively, after taking the timing cover off and checking that all the valves look like they're working OK, take a chance on there being no valve damage at all and just fit a new timing belt and water pump.

Mr Morlock wrote:If it were just a bent valve its repairable and you certainly do not need to spend $5K.

In the case of a bent valve though it's often more than simply replacing the valve that's needed, often bits of the valve break off and rattle around the combustion chamber, the pieces often ruin the cylinder walls, the head, and the piston crown.

An engine rebuild can quite easily reach $5,000 once you cater for replacement parts, and more importantly, machining.



Luckily though, for the OP, there's a pretty low chance of the valve being bent since as said above, the B6 and BP are non interference engines.
Most likely it's just a snapped timing belt, and an engine rebuild won't be necessary.

It should be a matter of simply replacing the belt, and making sure to set the cam timing correctly.

Perfect excuse to swap motors and flog off the bits from your seized motor as manga_blue suggested


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take it elsewhere.

that mech doesnt know what hes talking about....sounds like you have a worn keyway.
any competant mechanic would simply replace the belt and accesories and water pump and do the "loctite Fix" and youll be on the road for like a grand. some mechanics are fuckin dumb...anyone heard of google??? FFS its not hard.
worst case scenario replace it with another 1800 motor..no where near 5K. that guy is taking the piss big time. sh*t how much is a genuine brand new long block from mazda???? i think NC motors were only around 4.5-5K
i remember a guy saying he could get 2.3 MPS long blocks for about 3k...