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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 320SI owners - anyone with a liner swap engine?



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      04-08-2014, 01:39 PM   #1
Jan E.
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320SI owners - anyone with a liner swap engine?

Anyone with the N45B20S engine that has a steel liner swap installed?
I'm thinking of the HT Howard job, or any other liner swap.

Have you experienced any problems?
Please give feedback on mileage after swap. Regardless problem or not.
And where was the work done?


I have my engine in for the liner swap (crack in old alu liner) now here in Norway. And they done one car earlier.
Now the first car has developed a high oil usage. They opened that engine, but found nothing wrong. So they suspekt that the steel liner maybe vibrates?
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      05-15-2014, 10:17 AM   #2
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They had already installed some thicker liners in my block that on the oil-using-engine. And they were in contact with the liner factory to design and make even thicker to install instead.

But then the owner of the oil-using-engine decided to go for a new original block instead.

When the machine shop got the new engine they told that the new block have a new design. It comes now with steel liners instead of the old aluminum liners. And it looks like a much sturdier and better design.
The problem was that on the new block the crank only had 1/100mm (39/1000 inch?) clearance. And that was with the thinnest bearing shell
So they ordered another new block. And same on that one: 1/100mm clearance.

They say that they don’t install anything under 2/100mm. Couse they are reliable for the warranty. And 2/100 is still little. Especially here in Norway where there can be -35 dgr (-31F) some places during winter.

They got the papers from BMW claiming that the spec for the crank supposed to be 2-6/100mm after production.


That means that BMW gives out the new modified blocks outside there owne specifications
(Wasn’t there back in the days some 30 engines rejected after production? What was that rejection based on? And I guess that was old stile aluminum liner blocks?


So now the machine shop awaits answer from BMW that they take responsibility for the close tolerance, and that 1/100mm is enough. Or that they can machine up the clearance, but BMW still holds the warranty if something happens...


Hmmm. Concerning that BMW has redesigned the blocks to something that finely looks like the problem should be history, and introduces a new problem...
Anyone know when BMW began producing the block with steel liners?

Last edited by Jan E.; 05-15-2014 at 10:24 AM.
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      09-08-2014, 05:34 AM   #3
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The shop was given all clear from BMW to machine up the clearance.
Now I get a BMW factory produced steel liner block, and not an after marked liner insert job
The old block BMW wanted in return as a core refund charge.

Last edited by Jan E.; 09-09-2014 at 05:45 AM.
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      09-08-2014, 06:14 PM   #4
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