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Old 12-26-2011, 02:42 AM   #12 (permalink)
mrpham
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Join Date: Oct 2011
Location: Australia
Posts: 560
Default Re: mrpham's summer build

So a pretty big update =)

http://omgpham.com/valve-stem-seal-leak

After doing a cruise through Mt. Nebo, I had lost about 800mL of oil. There were no leaks so the oil simply burnt up in combustion. This is usually caused by old piston rings or valve stem seals.

A quick compression test showed all cylinders produced identical compression readings, this rules out piston rings as the cause. When valve stem seals leak, blue smoke is usually seen when you start the car up first thing in the morning. Oil slowly leaks past the seals into the cylinders overnight, then burns up as you start the car up. My MX-5 did something different though... Under engine braking/over-run, the crank case vacuum sucks oil past the seals. Then as soon as you step on the throttle again, huge amounts of blue smoke escapes from your exhaust.

Was thinking about blowing up my engine and putting a new one in, but did my research and found that it's fairly cheap to fix.
So here it goes =)



Firstly, I drained all the coolant and removed the top water hose as well as the intake piping. May as well remove the filter and air flow meter so you have more access to the exhaust manifold bolts. Everything was set to TDC, no need to though since the head is coming off.



Valve cover removed and showing the nice clean insides.



Cam pulleys removed and exhaust manifold un-bolted.



Camshafts and cam caps removed.



BOOOYAHHH! The head is off =)



I decided to keep the intake manifold on the head to make removal easier. But will be removed before I send it to the engine machine shop.

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