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Old 05-02-2018, 12:14 AM   #1
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Default Timing chain too tight?

I just finished a rebuild on my 90 d21 ka24e. The engine has a knockwitrh fresh bearings in it. When I put the timing set on I noticed the timing chain was tight without the pin pulled on the tensioner. Is this normal or could this be the cause of my knocking sound?
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Old 05-02-2018, 12:26 AM   #2
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They do seem to be rather tight when you initially release the tensioner. Don’t worry, that will loosen up once the chain and sprockets wear into each other. In fact, the chain is typically too loose on the KA.
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Old 05-02-2018, 03:37 AM   #3
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I guess I have to pull the motor then and tear it down.
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Old 05-02-2018, 03:47 AM   #4
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Are we talking about typical overhead cam noise, which is barely noticeable, or real knocking here?
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Old 05-02-2018, 06:18 AM   #5
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The engine had a slight knock so i rebuilt it. New bearings, pistons, oil pump all the goodies. On the initial start up there was some noise but most of it went away as soon as oil pressure built up. There's no oil light but it's knocking pretty loud. I don't know what else to do besides tear it back apart.
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Old 05-02-2018, 07:37 AM   #6
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could be your timing? double check that before you tear it up?
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Old 05-02-2018, 10:38 AM   #7
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I thought a knock was caused by a bearing that fails, allowing the piston rod to have a little gap between the main journal and the rod.

You replaced the main bearings. Right?
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Old 05-02-2018, 10:45 AM   #8
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He did say slight, a knock is usually obvious
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Old 05-03-2018, 08:17 AM   #9
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Quote:
Originally Posted by Framebender View Post
The engine had a slight knock so i rebuilt it. New bearings, pistons, oil pump all the goodies. On the initial start up there was some noise but most of it went away as soon as oil pressure built up. There's no oil light but it's knocking pretty loud. I don't know what else to do besides tear it back apart.
Have you identified whether the knocking is coming from the top end, or the bottom end? You can cut yourself an 24" length of broomstick, and start putting it against different places on the engine, top and bottom, to identify where the knock is exactly coming from. The other end goes near your ear. Try valve cover, exhaust and intake manifolds, and then oil pan.

*Another old-school guy suggestion. Not guaranteed.*
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Old 05-03-2018, 10:07 PM   #10
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Ok so I found the noise before I pulled the engine. Turns out when i meshed the engine and trans something with the clutch was hitting. My neighbor says throw out bearing wasn't seating right. It worked itself into place while we listened and went silent. Huge relief!
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