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post #1 of 2 (permalink) Old 06-15-07, 10:53 PM Thread Starter
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KA Laser firing order ? and other problems

Hi all Im a noob here could anyone inform me what the firing order is on a 1.5 laser motor .

Second thing Ive just replaced the head on the laser 1.5 l the new head had a bent valve so had to replace all the valves with the old ones from the old head . Put it all back togeather and adjusted the tapits (the valves where slightly shorter ) etc but is making a uniform tapping sound at rpms over about 1000 , which isnt as loud as the bent valve was any ideas to what maybe making said given noise ?

Could someone let me know what the tapit gaps are meant to be I was told 8 thou for the intake and 10 thou for the exorst

I only have a metric set and beleave I set them to 0.020 and 0.025 is this the right settings ?

thanks in advance and hi to all

ps I did also break one of the valve guides so I had to steal one from the other head . Would this possibly be the cause ? the valves on the replacement head where slightly longer above the springs but presumably that wouldnt make a difference

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post #2 of 2 (permalink) Old 06-26-07, 01:44 AM
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Re: KA Laser firing order ? and other problems

As far back as I can remember, the Laser engine firing order has always been 1-3-4-2. Tappet clearences are a different issue altogether because these change for different year models, types of engines, and capacities.
You'll probably need to know what engine model you have before you can find any accurate info on it, say B series (B3, B5, B6) or E series (E3, E5) and so on.
About your last comment, a valve that is longer than what it should be will always be pushed by the camshaft (or tappet or whatever the case may be) and therefore will always be open. This causes your engine to loose compression because the inlet valves stay open when they should be closed and never have fresh air in the cylinder because it will suck from the exhaust as well as the inlet. You'll also loose a part of the fuel that's injected through the open exhaust valve and in a short time you'll burn the valve seats and faces. So, the noise you're hearing may be the normal combustion coming through the open valves. I think you should either repair that head properly or get a second hand one that's similar to the one you removed first. Your firing order is probably right but the car will never idle properly unless the valves are fixed. Hope this helps, cheers
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