Hello,
As title says, do I need to drain engine oil for replacing timing chain/guide? This is for N18 motor.
I just did the engine oil change last week and planning to do timing chain/guide next week hence the question.
Thanks!

 

First, I think I would have done the timing chain 1st.

Second, are you doing the timing chain/tensioners as a preventative or do you have a cause?

 

I'll be doing the chain/guide as "while I'm in there", because I'll be doing the valve stem seal.

 

I'm 98% sure that the timing chain service is all done above the oil level in the oil pan. You could probably do it without draining the oil.

 

To change the timing chain, you have to remove the front crankshaft hub bolt (the bolt must be replaced). One the hub is removed, you've disturbed the seal between the hub and the seal, so you'll want to replace the seal. If you don't drain the engine oil, there is a chance some oil will leak out of the block when you remove the hub seal.

Remember the new hub seal must be installed dry (do not oil it), once installed, it must sit (no engine rotation) for 4 hours to normalize. Failure to do this will result in an oil leak. Install the hub first, and then press the seal into place.

 

Yes. That's was my worry too. There might be enough oil to leak out from the hub bolt hole as the hub bolt and seal is removed.

For anyone who replace timing chain/guide, did you guys drain engine oil?

 

No, it's not in the TIS list of preliminary tasks for timing chain replacement.

 

Oh nice. Thanks!!

 

FWIW, I just replaced my timing chain after an oil change and didn’t change the oil afterwards. No oil leaked out during the seal replacement.

Peter

 

Great. Thanks!!
Wondering.. how many hours did it take?

 

Ha! Too many but I’m retired and its my third car so I didn’t care. Probably three days but an experienced shop guy could probably do it in a few hours, (maybe I could repeat it on a Saturday).

I also replaced my valve guide seals so I bought a ton of specialty tools for the valve timing, crank holding, seal installation, and valvotronic springs.

Peter

 

Good to know. Thanks! I'm going to take time with it too. Not rushing. 3-4 days I guess.