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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 10-19-2019, 03:39 PM   #1
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KA24DE 91 240sx ticking and wont rev past 3000

I have recently installed a used engine in my 240. Finally got the distributor set and its started up. My only problem now is it wont rev past 3000rpm and i hear a ticking noise to be coming form the valve cover. Any ideas on my next step to bringing my baby back from the grave? I couldnt figure out how to upload my video from my iphone but i could email to anyone willing to help me through this. Thanks!
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Old 10-19-2019, 03:46 PM   #2
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Update

Just cleaned the MAF and now it rev prefectly. Only this is it deffinatly has a ticking noise and im scared to drive it.
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Old 10-19-2019, 04:01 PM   #3
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Mine has a tick sound too but I feel like it’s normal for an old engine, now if it’s super loud then I would look into it



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Old 10-19-2019, 04:02 PM   #4
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Yeah im gonna take it for a spin and see how it drives. I just hope its not a bad "tick" and im not sure how to look into it.
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Old 10-19-2019, 04:06 PM   #5
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It’s called valve slash, my buddy did it in his KA when he rebuild it

If it sounds loud you might want to look into that


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Old 10-19-2019, 04:06 PM   #6
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Start it up with the valve cover off....then listen for noise
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Old 10-21-2019, 08:50 AM   #7
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can also be the timing chain being loose...eg tensioner sticking or alternately the upper guide removed
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Old 11-02-2019, 12:04 PM   #8
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Update

So I reset the distributor and cleaned the MAF and she runs!!!!! Now I still have the ticking so I went ahead and checked my valve clearance. Everything seems to be close expect for cylinder 1. I have .008 and .012 for clearance on the intake valves and .012 and .014 on the exhaust valves. I guess I need to see if I can remove a shin from the intake bucket to get closer to .012
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Old 11-02-2019, 05:39 PM   #9
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You have to find the right size shim to get the clearance

You have to see what size shim is In there then go to steps down


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Old 11-03-2019, 10:41 AM   #10
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I’m going to search today and see if I can find the old shins from my old engine. If not I guess I’ll have to order some. How can I tell if it’s the timing chain that’s making the noise and not the buckets? Also I’ve driven it around the block a few times and it doesn’t have too much throttle response. I think maybe my injectors might be gunked up. Was thinking about just ordering some cheapninjectors off rock auto.
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Old 11-05-2019, 02:47 PM   #11
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Check if your exhaust manifold is leaking, I put a new gasket and sealed it up, also was missing 2 studs, I was getting ready to replace the rockers, but after sealing it right, no ticking

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