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C250 Sport - No oil change in 6 years and 50K miles.

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C250 Sport - No oil change in 6 years and 50K miles.

 
Old 04-02-2019, 02:11 AM
  #51  
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2013 C250 SPORT, 2014 WRX STI SEDAN, 2017 E300 4MATIC
Originally Posted by Kelvin Bellrose View Post
How's your head?
The head is still at the machine shop. The turn around time is a week and a half so I am at a standstill right now until I get the head back. I am optimistic however because the car was running normally and my personal inspection and checks indicated it was not warped or cracked.
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Old 04-02-2019, 02:20 AM
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Considering you only popped a had gasket I think you have a good chance of getting it running again.
Are you going to put new cans and lifters in?
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Old 04-02-2019, 03:28 AM
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Originally Posted by Kelvin Bellrose View Post
Considering you only popped a had gasket I think you have a good chance of getting it running again.
Are you going to put new cans and lifters in?
Not planning to at this time. There is no scoring on the cams/cam housing and lifters also have no deformities. I kept track where each lifter came from and will return it to the same place.
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Old 04-15-2019, 09:12 PM
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Got the head back from machine shop today. Sub assemblies completed. Will start rebuild on the weekend.



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Old 04-16-2019, 03:15 AM
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Damn I like this thread
I hope the engine runs well again.
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Old 04-17-2019, 05:22 AM
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MBpippo

You still have to watch out for the timing chain.

It’s just a simplex chain with a propensity to stretch and jump timing.

This alone could cause major damage to the engine.

Worst case would be a timing chain breaking apart and causing even worse damage to the engine.

For further info just google search for “m271 timing chain stretch”.

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Old 04-17-2019, 05:27 AM
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Originally Posted by Joe1959 View Post
MBpippo

You still have to watch out for the timing chain.

It’s just a simplex chain with a propensity to stretch and jump timing.

This alone could cause major damage to the engine.

Worst case would be a timing chain breaking apart and causing even worse damage to the engine.

For further info just google search for “m271 timing chain stretch”.
I am changing the timing chain as well. I had to break it
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Old 04-17-2019, 03:36 PM
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Please buy a white Coat for when working on the car and look professional, just for the hell of it, I want to compare your white coat to the ones worked on my car.
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Old 04-17-2019, 04:59 PM
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Originally Posted by Moto_Guzzi View Post
Please buy a white Coat for when working on the car and look professional, just for the hell of it, I want to compare your white coat to the ones worked on my car.
Or at the very least he can use the white gloves that come with the car to change a tire,
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Old 04-17-2019, 05:01 PM
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Looking good OP! Looks like you'll be ready for the next 50k soon.
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Old 04-18-2019, 12:16 PM
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It is disgusting to look at the final result of your "experiment" and yes, it is your own business how you maintain your own car, however people like you can get other, innocent people in big trouble. Imagine you had sold your car 2 months prior to the problem and then someone else would have had to do all the repairs for his "new" car.

Last edited by dol4er; 04-18-2019 at 04:38 PM.
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Old 04-24-2019, 11:07 PM
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It has a while since I did anything on this experiment as I was waiting for some parts I ordered to get here and time was also in short supply. Anyway I now have all the parts I need and started the build this evening. This is what I have gotten done so far.



Torque specs and pattern


All parts ordered are here and reusable parts are cleaned and prepped. Ready to start the build


Head gasket and exhaust gasket placed. Zip ties are being used to temporarily align and hold in place the exhaust gasket.


Head placed and aligned.


New head bolts placed on their holes. Tighten until flush with head.


A 3 step torque is required to torque the head bolts. 1. The first step is torque to 45 N-m following the pattern on spec above. 2. Wait 10 minutes then then torque each bolt 90 degrees further following the same pattern again for step 2. 3. Wait 10 minutes then then torque each bolt 90 degrees further following the same pattern again for step 3. Torque is set for 45.4 N-m because my torque wrench has a tolerance of +/- 1%.

Last edited by azblk; 04-25-2019 at 01:43 AM.
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Old 04-25-2019, 10:39 AM
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OP, I would be remiss were I not to indicate "You've got a lot of grit"..........................

Thanks for keeping us in the loop.

ez
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Old 04-25-2019, 11:13 AM
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Incredible to me how neat, precise and organized you are with this. All the more puzzling how someone with those personality traits got the engine to the state it is in. Hope it all works out when you are done. From the pictures it looks like you are putting together a new engine from scratch.
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Old 04-25-2019, 11:39 AM
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Greatest thread ever keep us in the loop
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Old 04-25-2019, 12:47 PM
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Indeed, this is a thread worth following up. AZBLK keep up the good work
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Old 04-25-2019, 04:31 PM
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Finishing the head and exhaust manifold installation.



Second and third step head bolt torque involves turning the bolts 90 degrees following the torque pattern above. Wait 10 minutes between both torques.



Next attach the exhaust manifold by screwing lightly a few of the head bolts or studs.



Cut/remove the zip ties used earlier to align/hold in place the gasket.



install all 8 bolts/studs and torque to spec. MAKE SURE you coat the bolts with anti-seize before installing them !!!.



Head and exhaust manifold installed and torqued to spec.


Next I will install the cam housing. There is an RTV gasket between the head and the cam housing. I used Loctite 5900 which MB also uses.


Before applying the RTV thoroughly clean the sealing surfaces. I used a razor blade to scrap the surface and used a non lint cloth and acetone to remove any oil and dust. When surface was clean and dry, I traced the RTV path with a sharpie and then applied the RTV.

I did not take any picture of the applied RTV as it starts to cure quickly. Anyway after aligning and installing CAM housing. I clamped the front and the back to apply pressure and I will leave the clamps(vice grips) on overnight.

Last edited by azblk; 04-25-2019 at 11:21 PM.
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Old 04-26-2019, 05:37 AM
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Wow, this is really coming along now. Thanks for the pics & commentry
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Old 04-26-2019, 09:39 AM
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So synthetic oil really turns nasty. I wonders if you store a modern engine with synthetic versus mineral oil for 10 years what both would look like-?
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Old 04-26-2019, 11:45 AM
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The biggest question here that no one asked yet is... Are you going to do oil change now on?
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Old 04-26-2019, 12:41 PM
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Originally Posted by white46 View Post
The biggest question here that no one asked yet is... Are you going to do oil change now on?
Who has time for that? I dont have to worry about it for another 50K miles.
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Old 04-26-2019, 01:00 PM
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Originally Posted by azblk View Post
Who has time for that? I dont have to worry about it for another 50K miles.
Hey. I like you.
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Old 04-26-2019, 06:46 PM
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While waiting for the RTV to fully cure I reinstalled the timing chain guides and pins.

I also reinstalled the cam lifters and rocker arms. Since i decided right away that I was going to re use these i kept track of where each came from and I returned each to the same spot. I used sandwich bags marked E1/I1 for exhaust 1/ intake 1 and so forth.

Apply assembly lube to the cam cradles. Be generous since it will dissolve in the engine oil and the engine will start dry before oil makes its way up.

Both cams installed. Make sure the correct cam goes to the correct side. Not sure if you can swap them anyway.

Lube the cam cradles on cam housing covers with assmbly lube and then reinstall

reinstall the cover bolts and torque to spec. The torque spec and pattern attached below.

Torque spec for cam housing


Next I will set the timing and reconnect the timing chain. When that is completed it will be down hill from there.
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Old 04-28-2019, 09:55 AM
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it takes 15 minutes to do an oil change and it only costs 50$ a change, this repair has to be in the thousand dollar range and taking you more than 15 minutes. even through 50,000miles you'd end up with less time/ money spent just changing the oil.


I hope you don't sell this car to some poor kid down the road.....
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Old 05-02-2019, 10:41 AM
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Hang in there AZ. Your picture's on the piano.

best,




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