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#1
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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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Jim |
#2
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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
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WTF? Where they using water from a muddy creek as coolant?
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I was going to guess a Fiat but almost the same thing!
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#5
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I looked twice and don't see it, where is the timing belt?
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#6
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Its probably never been changed before.
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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. |
#7
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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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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 - given away 1980 Redhead: Darling Wife |
#8
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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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Jim |
#9
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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 - given away 1980 Redhead: Darling Wife |
#10
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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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Jim Last edited by engatwork; 01-17-2015 at 07:09 PM. |
#11
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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 - given away 1980 Redhead: Darling Wife |
#12
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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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Jim |
#13
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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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"Our Lady of Blessed Acceleration... don't Fail Us Now" |
#14
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Quote:
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. |
#15
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That looks like my truck's cooling system...after 2 flushes.
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
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