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Old 11-17-2017, 02:53 PM   #1
pokesgolfcarts
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Default Valve replacement lost compression

I have a pre-MCI Robin 295 motor that had 150 PSI in one cylinder, and zero in the second cylinder. I replaced all 4 valves and the seals and now compression is at 60 PSI both cylinders, what am I missing/ what should I check for?
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Old 11-17-2017, 04:25 PM   #2
Spicyunicorn
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Default Re: Valve replacement lost compression

Did you time the cam?
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Old 11-17-2017, 04:28 PM   #3
pokesgolfcarts
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Default Re: Valve replacement lost compression

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Originally Posted by Spicyunicorn View Post
Did you time the cam?
Do you mean by lining up the dots/notches on the two pulleys? If so then yes. I should also mention it ran really well for the 1st hundred yards before gradually slowing to a stop.
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Old 11-17-2017, 04:31 PM   #4
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Default Re: Valve replacement lost compression

Yes that's what I was referring to have you rechecked valve lash?
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Old 11-17-2017, 04:35 PM   #5
pokesgolfcarts
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Default Re: Valve replacement lost compression

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Originally Posted by Spicyunicorn View Post
Yes that's what I was referring to have you rechecked valve lash?
Yes, .004 correct?
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Old 11-17-2017, 07:24 PM   #6
pokesgolfcarts
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Default Re: Valve replacement lost compression

Should I have lapped the valves? Could that cause this problem?
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Old 11-17-2017, 10:28 PM   #7
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Default Re: Valve replacement lost compression

Next is a leak down test, maybe a valve is sticken open
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Old 11-18-2017, 06:40 AM   #8
cart around
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Default Re: Valve replacement lost compression

Whatever it is, it affected both cylinders, and happened suddenly.

I would say something with the timing belt, or cam.

What else is common to both cylinders, and affects compression?
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Old 03-26-2018, 03:15 PM   #9
rib33024
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Default Re: Valve replacement lost compression

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Originally Posted by cart around View Post
Whatever it is, it affected both cylinders, and happened suddenly.

I would say something with the timing belt, or cam.

What else is common to both cylinders, and affects compression?
Blown head gasket
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Old 03-26-2018, 04:41 PM   #10
Gearhead1956
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Default Re: Valve replacement lost compression

Did you reuse the old head gasket??
torque the head properly?
60 lbs both cylinders, maybe blown head gasket between the 2 cylinders?
Even without lapping in the valves it should have more then 60 lbs

I would recheck timing belt and timing marks 1st!
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