How to remove and install Piston ring and piston/connecting rod assemblies on BMW 325i?

Before removing the piston/connecting rod assemblies, check for rings at the maximum travel limit of the ring and remove those rings when necessary. Flip on the engine so that its crankshaft faces upwards. Use feeler gauges to check the connecting rod endplay and get a service limit from an automotive machine shop. Find out whether identification marks are present on the connecting rods and caps then mark them if they are not available. Loosen all connecting rod cap bolts and remove each cap and bearing insert. Drive each connecting rod/piston assembly through the top of the engine. Repeat this process for other cylinders too. Reassemble the connecting rod caps and bearing inserts in their respective connecting rods after removal. Check these new piston rings before they are installed to make sure their ends meet, adjusting them as required otherwise. Proceed to put rings onto pistons according to correct order only; then install pistons/rods assemblies after cleaning cylinder walls with chamfered upper edge in each bore and ensuring that a crankshaft is in place. Clean up bearing surfaces of both connecting rod big-end bore/cap and fit new upper bearing insert thereon. Lower bearing insert should be fitted into rod cap while making sure that piston ring gaps were located 120 degrees apart around its perimeter for proper positioning on piston top assembly along with lubricating it using clean engine oil before compressing them by inserting suitable piston ring compressor over until such point when all projections have been pressed down with enough force just like back into cylinder block holes provided by manufacturer themselves requiring rotation of crankshaft then later applying oil on cylinder walls followed by gentle installation of piston/rod assembly right inside cylinder bore guiding connection rods towards journal part of crankshaft itself ending up with checking connection bearings oil clearance applied Plastigage to be removed afterward in case it was not within range: keep supporting elements clear off any dust or contaminants since it has been already greased either way slid again onto initial position over journal, put rod back then tight those nuts repeated rest cylinders as well turning crank test binding on play.

Genuine BMW 325i Piston Ring

Piston Ring Set

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BMW 325i Piston Rings Repair Kit
Part Number: 11257511697
$87.30 MSRP: $102.63
You Save: $15.33 (15%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Repair Kit Piston Rings; Piston Ring Set, Piston Rings
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)
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BMW 325i Piston Rings Repair Kit
Part Number: 11251713195
$59.61 MSRP: $67.04
You Save: $7.43 (12%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Repair Kit Piston Rings
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1995 BMW 325i | Convertible(E30), Coupe(E30), Sedan(E30), Sedan(E36)
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BMW 325i Piston Rings Repair Kit
Part Number: 11257559434
$99.06 MSRP: $127.22
You Save: $28.16 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Repair Kit Piston Rings; Piston Rings
- Replaces: 11-25-7-547-838
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2006 BMW 325i | Sedan(E90)
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BMW 325i Piston Rings Repair Kit
Part Number: 11251437054
$96.91 MSRP: $113.93
You Save: $17.02 (15%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Repair Kit Piston Rings
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1992-1995 BMW 325i | Convertible(E36), Sedan(E36)
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BMW 325i Piston Rings Repair Kit
Part Number: 11251437079
$104.45 MSRP: $122.80
You Save: $18.35 (15%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Repair Kit Piston Rings
- Replaces: 11-25-1-738-738
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1992-1995 BMW 325i | Convertible(E36), Sedan(E36)
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BMW 325i Piston Rings Repair Kit
Part Number: 11251437078
$104.45 MSRP: $122.80
You Save: $18.35 (15%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Repair Kit Piston Rings
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1992-1995 BMW 325i | Convertible(E36), Sedan(E36)
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BMW 325i Piston Rings Repair Kit
Part Number: 11257511699
$109.10 MSRP: $128.27
You Save: $19.17 (15%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Repair Kit Piston Rings
- Replaces: 11-25-7-505-018, 11-25-7-509-218
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)
View related parts
BMW 325i Piston Rings Repair Kit
Part Number: 11257511698
$109.10 MSRP: $128.27
You Save: $19.17 (15%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Repair Kit Piston Rings
- Replaces: 11-25-7-509-217
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)
View related parts
BMW 325i Piston Rings Repair Kit
Part Number: 11251437077
$84.96 MSRP: $98.24
You Save: $13.28 (14%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Repair Kit Piston Rings; Piston Ring Set, Piston Rings
- Replaces: 11-25-1-738-736
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1992-1995 BMW 325i | Convertible(E36), Sedan(E36)
View related parts
BMW 325i Piston Rings Repair Kit
Part Number: 11251713194
$55.80 MSRP: $64.52
You Save: $8.72 (14%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Repair Kit Piston Rings
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1995 BMW 325i | Convertible(E30), Coupe(E30), Sedan(E30), Sedan(E36)
View related parts
BMW 325i Piston Rings Repair Kit
Part Number: 11251713193
$55.80 MSRP: $64.52
You Save: $8.72 (14%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Repair Kit Piston Rings
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1995 BMW 325i | Convertible(E30), Coupe(E30), Sedan(E30), Sedan(E36)
View related parts
BMW 325i Repair Kit Piston Rings
Part Number: 11251713192
$109.10 MSRP: $128.27
You Save: $19.17 (15%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Piston Rings
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1995 BMW 325i | Convertible(E30), Coupe(E30), Sedan(E30), Sedan(E36)

BMW 325i Piston Ring

The BMW 325i Piston Ring creates a tight seal between each piston and cylinder wall, trapping combustion pressure to efficiently turn fuel into motion. Every Piston Ring stack on a typical BMW 325i piston makes use of two compression rings to prevent gas leakage and one oil control ring which wipes excess lubricant back to the sump, balancing friction and lubrication. Early versions applied thicker cast iron rings, but more recent BMW 325i models use more slender designs made of steel or ductile iron, sometimes with only 1 mm on the top groove, which bend more easily to the bore and reduce costs in terms of the friction losses that once made up almost a quarter of the mechanical drag. The top Piston Ring typically has a plasma-moly or chromium face coating to cope with the intense heat while lower rings are designed to cope with oil control. A damaged Piston Ring is a fast way to lose power and increase oil consumption. Each Piston Ring is sprung by its own tension, so it is constantly pressed against the cylinder during the rapid travel of the piston. Together these advancements allow modern BMW 325i engines to seal better, run cooler, and waste less energy.

If you are looking for OEM BMW 325i Piston Ring, we highly recommend to shop with us. Not only do we offer budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 325i Piston Ring that come backed by the manufacturer's warranty.

BMW 325i Piston Ring Parts Questions & Experts Answers

Piston Rings Repair Kit
11257559434
Q:
How to remove and install Piston ring and piston/connecting rod assemblies on BMW 325i?
Posted by Rayduan S.
A:
Before removing the piston/connecting rod assemblies, check for rings at the maximum travel limit of the ring and remove those rings when necessary. Flip on the engine so that its Crankshaft faces upwards. Use feeler gauges to check the connecting rod endplay and get a service limit from an automotive machine shop. Find out whether identification marks are present on the connecting rods and caps then mark them if they are not available. Loosen all connecting rod cap bolts and remove each cap and bearing insert. Drive each connecting rod/piston assembly through the top of the engine. Repeat this process for other cylinders too. Reassemble the connecting rod caps and bearing inserts in their respective connecting rods after removal. Check these new piston rings before they are installed to make sure their ends meet, adjusting them as required otherwise. Proceed to put rings onto pistons according to correct order only; then install pistons/rods assemblies after cleaning cylinder walls with chamfered upper edge in each bore and ensuring that a crankshaft is in place. Clean up bearing surfaces of both connecting rod big-end bore/cap and fit new upper bearing insert thereon. Lower bearing insert should be fitted into rod cap while making sure that piston ring gaps were located 120 degrees apart around its perimeter for proper positioning on piston top assembly along with lubricating it using clean engine oil before compressing them by inserting suitable piston ring compressor over until such point when all projections have been pressed down with enough force just like back into cylinder block holes provided by manufacturer themselves requiring rotation of crankshaft then later applying oil on cylinder walls followed by gentle installation of piston/rod assembly right inside cylinder bore guiding connection rods towards journal part of crankshaft itself ending up with checking connection bearings oil clearance applied Plastigage to be removed afterward in case it was not within range: keep supporting elements clear off any dust or contaminants since it has been already greased either way slid again onto initial position over journal, put rod back then tight those nuts repeated rest cylinders as well turning crank test binding on play.
Answered by BMW Parts Specialist Blaine / Aug 22, 2025

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