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Unread 07-02-2013, 07:57 PM   #1
zx150
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258 rattles under load

I've got a 258 with 80K or so on a rebuild. A year or two ago it started rattling only under very heavy load pretty much only on steep HWY inclines at 70+ MPH. It's been getting progressively worse and now does it on every hill or when you give it a decent amount of throttle.

The best way to describe the noise is like the rattle of a diesel engine. Is this ping or do I need to check and adjust the valve lash?

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Unread 07-02-2013, 11:30 PM   #2
DaemonForce
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What is your gearing and how long ago did you change the oil?
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Unread 07-03-2013, 05:47 AM   #3
zx150
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Quote:
Originally Posted by DaemonForce View Post
What is your gearing and how long ago did you change the oil?
Gearing is 2.35 and just changed the oil last week. Oil gets changed in this one religiously.
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Unread 07-03-2013, 02:43 PM   #4
DaemonForce
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Your gearing is unusually high, I get the same thing with my 2.73 gearing but I'm willing to bet I deal with less noise. It might be time to swap gears.

The engine oil is another matter that needs to be monitored carefully. If you have excessive blowby or usage like I did you'll probably want to look into doing an overhaul soon.
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Unread 07-03-2013, 03:05 PM   #5
zx150
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Quote:
Originally Posted by DaemonForce View Post
Your gearing is unusually high, I get the same thing with my 2.73 gearing but I'm willing to bet I deal with less noise. It might be time to swap gears.

The engine oil is another matter that needs to be monitored carefully. If you have excessive blowby or usage like I did you'll probably want to look into doing an overhaul soon.
It's stock gearing for an AMC Eagle and the engine is a very recent rebuild. Fuel mileage is great so I'm leaving the gearing alone.

Oil wise at every oil change it's never really been black. It's still pretty clear when it drains out.
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Unread 07-03-2013, 08:53 PM   #6
DaemonForce
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It's stock gearing for an AMC Eagle and the engine is a very recent rebuild. Fuel mileage is great so I'm leaving the gearing alone.
Sure, until you need to pull it up anything more than a 2% incline above 60mph.
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Oil wise at every oil change it's never really been black. It's still pretty clear when it drains out.
So the engine is far from tired. What kind of reading are you getting from oil pressure?
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Unread 07-03-2013, 09:49 PM   #7
cruiser54
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Check your ignition timing and set it to factory spec.
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Unread 07-04-2013, 12:13 AM   #8
zx150
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Originally Posted by DaemonForce View Post
Sure, until you need to pull it up anything more than a 2% incline above 60mph.

So the engine is far from tired. What kind of reading are you getting from oil pressure?
This is a daily driver, not a wheeler. I have no problem pulling Vail Pass(10K FT) and climbing up to Eisenhower Tunnel(11K FT) at 70+ without having my foot way into the pedal. Both of those routes are 7% or more.

Oil pressure is right where it should be and compression is between 140-150 across the board.

It's not lacking power or anything like that but just making noticeable noise.

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Check your ignition timing and set it to factory spec.
Will do.
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