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  #1  
Old 01-16-2015, 09:11 PM
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The easiest timing belt job I've ever done

Had a 91 Mazda Miata in the shop this week needing cooling system rebuild (199k miles showing on clock). Went ahead and replaced water pump and timing belt. The timing belt had to be the easiest one I've ever done. Nothing to this one. I suspect the cooling system had never been serviced. The radiator was plugged up. Here is the thermostat. Surprisingly enough the engine is fine.

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  #2  
Old 01-16-2015, 09:34 PM
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Great drivetrains. Make sure you torqued and Loctited the crank bolt correctly and used a new key. Those motors are prone to crank pulley wobble that eventually eats the end of the crank. Other than that, they're basically bulletproof.
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  #3  
Old 01-16-2015, 10:04 PM
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WTF? Where they using water from a muddy creek as coolant?
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Old 01-16-2015, 10:17 PM
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I was going to guess a Fiat but almost the same thing!
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  #5  
Old 01-16-2015, 10:45 PM
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Quote:
Originally Posted by tbomachines View Post
I was going to guess a Fiat but almost the same thing!
I looked twice and don't see it, where is the timing belt?
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  #6  
Old 01-17-2015, 07:42 AM
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Quote:
Originally Posted by super SEC View Post
WTF? Where they using water from a muddy creek as coolant?
Its probably never been changed before.
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  #7  
Old 01-17-2015, 03:21 PM
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Quote:
Originally Posted by spdrun View Post
Great drivetrains. Make sure you torqued and Loctited the crank bolt correctly and used a new key. Those motors are prone to crank pulley wobble that eventually eats the end of the crank. Other than that, they're basically bulletproof.
There's a pretty strong case to be made for replacing the crank bolt on the 1.6 Miata engines (90-93, though the bolt was replaced with a longer version somewhere in 91 or 92, if I remember correctly) anytime you take it out.
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Old 01-17-2015, 05:46 PM
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Thankfully I did not have to mess with the crankshaft bolt. I just had to remove the harmonic balancer and pulley.

I think this is one of the funnest driving cars I've ever driven.
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  #9  
Old 01-17-2015, 06:56 PM
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You have to remove the crankshaft bolt to get the HB and pulley off.....
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1961 220b: first project car - sold.
2000 CLK 430: first modern Benz - sold.
2001 CLK 55: OMG the torque!!! - sold
1972 280SE 4.5: Baby Gustav
1991 300TE 4Matic: Gretel the Snow Bunny - sold
1978 300SD: Katz the Free Man
1980 Redhead: Darling Wife
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  #10  
Old 01-17-2015, 06:57 PM
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I was able to replace belt by just removing the four fasteners that held the pulley and balancer onto the sprocket and hub.
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Last edited by engatwork; 01-17-2015 at 07:09 PM.
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  #11  
Old 01-17-2015, 09:33 PM
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Guess I just assumed you'd be replacing the front seal while you were in there - for that, the crank bolt must come out.
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1961 220b: first project car - sold.
2000 CLK 430: first modern Benz - sold.
2001 CLK 55: OMG the torque!!! - sold
1972 280SE 4.5: Baby Gustav
1991 300TE 4Matic: Gretel the Snow Bunny - sold
1978 300SD: Katz the Free Man
1980 Redhead: Darling Wife
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  #12  
Old 01-18-2015, 07:59 AM
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I did a lot of reading/studying and came to the conclusion that I'd be opening a can of worms if I pulled the crank pulley. Everything I read said if it is not leaking to leave it be. This particular model has a bad rep in regards to the threaded part of the crank where the fastener screws in.
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  #13  
Old 01-19-2015, 11:25 AM
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Miata Timing belt Tip: Don't add 'extra tension' on the idler tension bearing; the tension spring is just the right amount of pressure on the timing belt before tightening it.
Otherwise your idler bearing will make noise and wear out quickly.
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  #14  
Old 01-19-2015, 02:01 PM
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Quote:
Originally Posted by engatwork View Post
Thankfully I did not have to mess with the crankshaft bolt. I just had to remove the harmonic balancer and pulley.

I think this is one of the funnest driving cars I've ever driven.
Its a lotta fun. You can race people all the way to work weaving in and out of traffic and the cops just don't even see you at all. Don't explore the actual limit of adhesion on the street though cause it might leave the road backwards if you get too aggressive. Fortunately there is plenty of fun inside the limit.

I like it because there is enough power to kick the rear out a bit taking off and turning 90 degrees at the same time.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #15  
Old 01-26-2015, 07:18 PM
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Quote:
Originally Posted by super SEC View Post
WTF? Where they using water from a muddy creek as coolant?
That looks like my truck's cooling system...after 2 flushes.

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