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      11-07-2019, 05:45 PM   #1
Subrage
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Order in which to do maintece N55

I have a few item (OFHG's, Water pump / thermostat, and belt with new pulley's) to knock out this weekend on my 135is. Just want to make sure I have the right plan of attack.

Pull the engine cover, cowl, intake, under-body then fan.
Drain the oil and coolant
Pull the belt
Do the OFHG and cooler gasket
Replace the plastic coolant inlet with the metal version (next to the bottom ofh bolt)
Replace the water pump / Thermostat
Install old belt
Fill with oil and coolant
Bleed the cooling system
Pull the electrical plug on each of the fuel injectors
Do the oil priming procedure
Reconnect the injectors
Pull belt
Swap tensioner and pulleys
Install new belt
Install fan and Intake
Start car check for leaks
Install under-body, cowl and engine cover

Sound good? Or any recommendations?
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      11-07-2019, 07:01 PM   #2
dtla1
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Sounds like you have a pretty thorough plan of attack.
I've never heard of this oil priming procedure though, mind sharing?

Also, a couple extra things to maybe install while you're there. One would be the DV+ upgrade to beef up your diverter valve, and the other would be to install a Crankshaft seal plate, in case you ever have to deal with a shredded belt.

Probably too late for either of these though if you're planning to do the work this weekend.
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      11-07-2019, 09:15 PM   #3
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Quote:
Originally Posted by dtla1 View Post
Sounds like you have a pretty thorough plan of attack.
I've never heard of this oil priming procedure though, mind sharing?

Also, a couple extra things to maybe install while you're there. One would be the DV+ upgrade to beef up your diverter valve, and the other would be to install a Crankshaft seal plate, in case you ever have to deal with a shredded belt.

Probably too late for either of these though if you're planning to do the work this weekend.
Have you done this or know of anyone who has? I think it's something worth considering if not too difficult.
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      11-07-2019, 09:44 PM   #4
Subrage
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Quote:
Originally Posted by dtla1 View Post
Sounds like you have a pretty thorough plan of attack.
I've never heard of this oil priming procedure though, mind sharing?

Also, a couple extra things to maybe install while you're there. One would be the DV+ upgrade to beef up your diverter valve, and the other would be to install a Crankshaft seal plate, in case you ever have to deal with a shredded belt.

Probably too late for either of these though if you're planning to do the work this weekend.
Priming process in post #3

https://www.e90post.com/forums/showt...php?p=24400866

Some say it's not necessary, but who knows... But for a few minutes work, it can't hurt.

I'll look into that seal plate, might be a good spring time project.
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      11-08-2019, 09:34 AM   #5
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Quote:
Originally Posted by Subrage View Post
But for a few minutes work, it can't hurt.
Actually... I can't say if it's the case for this particular process or not but it is indeed possible for extra steps, especially if unnecessary, to hurt. You break something pulling it apart, cause a new issue during the process because something is missing, strip something putting it back together, and so on.

If it is needed, it'll be in an official BMW procedure. Otherwise I'd say there's a reason it's not commonly done, and that is because it is not needed. Not everything that sounds good is good. Feel free to go for it, it'll probably turn out fine, but at least consider if it's really worthwhile or not.
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      11-08-2019, 12:01 PM   #6
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Quote:
Originally Posted by gjm120 View Post
Have you done this or know of anyone who has? I think it's something worth considering if not too difficult.
I haven't done it myself, but it seems to be getting positive feedback from people who have: https://www.e90post.com/forums/showthread.php?t=1620202
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