Timing Jumped

[ericrapp]

Yup- you need a special bolt that screws into the back of the block to locate the crank. A flat bar that locks the cam in position and a pulley holding tool so you don't break the bolt that got threaded into the block (or the block itself) while removing and reinstalling the crankshaft bolt (which also is suppose to be replaced everytime it is removed).

This whole story is bizarre. what design advantage would using a taper lock provide? I'm sure i've missed the obvious again, I can not see what drove M engenears to do this. I trust there is a reason, anybody anyone at all.

 

[Tenc_ms3x]

so i guess its time to get the head worked on.

 

[ForceFed]

Not neccesarily....Depending on what is damaged..You may be able to repair what you have.
You still havent said if your had any Interference contact.
Just because your timing slipped does not mean you made contact....Did any valves hit the pistons?

DO you even know?
Have you checked?

Thats where I would start.

 

[AutoXRacer]

If this info is correct...Mazda just dropped the ball on this one...
No key? Interference engine? Piece of crap!!!

I miss my Miata now... Belt driven timing and non-interference!!!! FTW
I should of just gotten a MS Miata with a Flying Miata turbo kit for 300 RWHP!!!!! (bang)

 

[Betelgeuse]

This whole story is bizarre. what design advantage would using a taper lock provide? I'm sure i've missed the obvious again, I can not see what drove M engenears to do this. I trust there is a reason, anybody anyone at all.

Found this link on google. It outlines several advantages of an interference design.

http://www.leemyles.com/articles/interference-engines-and-timing-belts.html

From what I've read, interference designs are very common on modern high compression engines. The key to their longevity is the is the nature of the timing belt. Chains are more durable than rubber and should negate any worries regarding breakage. However I'd like to know more about this 'tapered' design with respect to the crankshaft gear and why they used that. I'm sure there's a reasonable explanation for that as well.

 

[ericrapp]

Found this link on goggle. It outlines several advantages of an interference design.

http://www.leemyles.com/articles/interference-engines-and-timing-belts.html

From what I've read, interference designs are very common on modern high compression engines. The key to their longevity is the is the nature of the timing belt. Chains are more durable than rubber and should negate any worries regarding breakage. However I'd like to know more about this 'tapered' design with respect to the crankshaft gear and why they used that. I'm sure there's a reasonable explanation for that as well.

I am ok with that. But the taper lock design is harder to align as it draws the sprocket in as you torque it down. If the shaft or taper is out of tolerance even a tiny bit, I.D.- O.D.,it will not align and possibly not clamp enough on shaft. The only advantage I see at this point is ease of removal. Which defeats the point of using the chain. Still thinking on this one

 

[Fudgie]

There is no taper. It just tightens up and "voila" your good! I would love to hear input on why this set-up is worthy of being on any engine??

This whole story is bizarre. what design advantage would using a taper lock provide? I'm sure i've missed the obvious again, I can not see what drove M engenears to do this. I trust there is a reason, anybody anyone at all.

 

[Tenc_ms3x]

If this info is correct...Mazda just dropped the ball on this one...
No key? Interference engine? Piece of crap!!!

I miss my Miata now... Belt driven timing and non-interference!!!! FTW
I should of just gotten a MS Miata with a Flying Miata turbo kit for 300 RWHP!!!!! (bang)

I don't think that u should feel like that. I was mad at first but now its just life. When they designed this car they had good intentions I'm sure. I think the problem is that we're just not used to this type of design. everything has it's flaws. Just look at what i'm going through as something to help you and the rest of us MS3 owner. You'll know what to look out for and to keep an eye on.