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-   -   258 rattles under load (http://www.jeepforum.com/forum/f19/258-rattles-under-load-1544204/)

zx150 07-02-2013 07:57 PM

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?

DaemonForce 07-02-2013 11:30 PM

What is your gearing and how long ago did you change the oil?

zx150 07-03-2013 05:47 AM

Quote:

Originally Posted by DaemonForce (Post 15635325)
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.

DaemonForce 07-03-2013 02:43 PM

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.

zx150 07-03-2013 03:05 PM

Quote:

Originally Posted by DaemonForce (Post 15637441)
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.

DaemonForce 07-03-2013 08:53 PM

Quote:

Originally Posted by zx150 (Post 15637524)
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.:rolleyes:
Quote:

Originally Posted by zx150 (Post 15637524)
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?

cruiser54 07-03-2013 09:49 PM

Check your ignition timing and set it to factory spec.

zx150 07-04-2013 12:13 AM

Quote:

Originally Posted by DaemonForce (Post 15638738)
Sure, until you need to pull it up anything more than a 2% incline above 60mph.:rolleyes:

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.

Quote:

Originally Posted by cruiser54 (Post 15638967)
Check your ignition timing and set it to factory spec.

Will do.


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