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Rod bearing replacement - UPDATE

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FD3S
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Rod bearing replacement - UPDATE

Post by FD3S » Sun Apr 16, 2017 9:59 pm

Viren wrote: Sun Apr 16, 2017 7:41 pm
FD3S wrote: Sun Apr 16, 2017 7:01 pm
Viren wrote: Sat Apr 15, 2017 10:40 am

So to be a little more clear sometimes when pulling away up hill if you don't give enough gas the revs drop a little and I feel a vibration throughout the car (the cars idle is perfect, no issue with that, just the vibrations). Also when pulling away like normal there is an initial virbration. It has been getting gradually worse and I've booked the car in to have it looked at. Will let you guys know what the problem is.
The same applies for me. Below 750 rpm when I am in first gear I have noticeable vibrations. Also when the car is starting a cold start I have a slight vibration in the whole cabin. To be honest after the rod bearing replacement I have done only three runs with the car so I have to test it more so I can verify those situations.
That's interesting, where abouts are you based would be good to do a comparison if you want?
You are always welcome to come to Greece where my car is located to do the live comparison. :rofl: :rofl: :rofl:
I will watch how it goes within the next week and I will update you though.

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Rod bearing replacement - UPDATE

Post by Viren » Sun Apr 16, 2017 11:08 pm

:rofl:
Fair enough, that's a bit far! My cars going in to the mechanic on Tuesday so will also provide update after that.
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Rod bearing replacement - UPDATE

Post by BMWZ4MC » Mon Apr 17, 2017 1:49 am

An increase in NVH at idle is to be expected. The engine is more rigidly mounted, so more vibration is transmitted. This will be especially noticeable at the engine speed that matches the resonant frequency of the body shell.
I would expect a similar increase in vibration at multiples of that engine speed, but this is probably hidden by the noise and vibration generated by the car moving.
With the car in neutral, try to identify the exact rpm where the vibration is at its greatest, then raise the revs to multiples of that rpm with the car stationary. You'll likely find similar vibration at each multiple.
Of course, if it really is becoming more pronounced with use, it's worth checking the bolts are torqued correctly.
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Rod bearing replacement - UPDATE

Post by Viren » Fri Apr 21, 2017 10:57 am

So seems like the reinforcement plate needed a little tightening but that's it. The vibrations have definitely decreased and all in all I'm loving it! Now I need to get past the running in period and oil change at 500 miles. Then good to go!
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Rod bearing replacement - UPDATE

Post by BMWZ4MC » Sat Apr 22, 2017 2:02 am

Good stuff :thumbsup:
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Rod bearing replacement - UPDATE

Post by hopz121 » Mon Apr 24, 2017 10:36 am

Nice to hear buddy glad it's all sorted.

You going for the 500 Mile oil change then and not the 1200 Miles?

Did they put fresh oil in when the did the bearings?

Mine are getting done one Thursday with new OEM Mounts and PAS hose.
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Rod bearing replacement - UPDATE

Post by Viren » Mon Apr 24, 2017 1:17 pm

hopz121 wrote: Mon Apr 24, 2017 10:36 am Nice to hear buddy glad it's all sorted.

You going for the 500 Mile oil change then and not the 1200 Miles?

Did they put fresh oil in when the did the bearings?

Mine are getting done one Thursday with new OEM Mounts and PAS hose.
I'm changing tge oil at 500 miles and yes the oil is completely drained when rod bearings are changed so fresh oil is part of the service. I've just been taking it easy keeping it below 4k rpm. Once the oil has been changed then I'll raise the revs. The main reason people breakin an engine is the seat the valves. However taking it easy after a rod bearings change is precautionary, theoretically speaking there is nothing to break in as the parts do not make contact. However it's seen as good practice.
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Rod bearing replacement - UPDATE

Post by bmwaddict » Mon Apr 24, 2017 1:24 pm

Viren wrote: Mon Apr 24, 2017 1:17 pm
hopz121 wrote: Mon Apr 24, 2017 10:36 am Nice to hear buddy glad it's all sorted.

You going for the 500 Mile oil change then and not the 1200 Miles?

Did they put fresh oil in when the did the bearings?

Mine are getting done one Thursday with new OEM Mounts and PAS hose.
I'm changing tge oil at 500 miles and yes the oil is completely drained when rod bearings are changed so fresh oil is part of the service. I've just been taking it easy keeping it below 4k rpm. Once the oil has been changed then I'll raise the revs. The main reason people breakin an engine is the seat the valves. However taking it easy after a rod bearings change is precautionary, theoretically speaking there is nothing to break in as the parts do not make contact. However it's seen as good practice.
Is that what CPC recommends, changing oil 500 miles later?
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Rod bearing replacement - UPDATE

Post by Viren » Mon Apr 24, 2017 9:34 pm

Cpc said it should be okay to not change the oil as they ultrasonic clean the sump and other bits however for what it costs there can't be any harm. They change lots of rod bearings so would listen to their opinion but like i said if any bearing bits have rubbed of or if there is any dirt which made its way into the bottom end while it was all apart, I think a oil change seems reasonable. 500 miles is my own decision based on what I've read. 1200 miles is more for new engines or full engine builds.
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Rod bearing replacement - UPDATE

Post by bmwaddict » Mon Apr 24, 2017 9:38 pm

Thanks for the reply. Are you local to them? I'm only 10 miles up the Chesham road, would be good to meet for a chat if you're close by.
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Rod bearing replacement - UPDATE

Post by Viren » Mon May 01, 2017 9:43 am

bmwaddict wrote: Mon Apr 24, 2017 9:38 pm Thanks for the reply. Are you local to them? I'm only 10 miles up the Chesham road, would be good to meet for a chat if you're close by.
Sure bud. I'm in edgware so not far. Drop me a pm and we can organise a meet.
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Rod bearing replacement - UPDATE

Post by mr_z4mc_oz » Tue May 02, 2017 4:04 am

How many miles or kilometers should you be doing the rod bearing replacement at to be on the safe side?

Thanks

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Rod bearing replacement - UPDATE

Post by GuidoK » Tue May 02, 2017 4:22 am

50k miles/80k km

So if a rod bearing replacement repair costs £1000 its an added 0,02ct/mile or 0,0125ct/km running cost.
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Rod bearing replacement - UPDATE

Post by mr_z4mc_oz » Tue May 02, 2017 6:12 am

Thanks. I still have a little while to go (around 4yrs) until I get there...

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Rod bearing replacement - UPDATE

Post by hopz121 » Tue May 02, 2017 8:13 am

How is the running in going OP?

I have managed 40 miles so far so this could take a while.... I am finding it very boring that's for sure.

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