Sierra Valve Stem Seals (8) 18-0347, Replaces Mercruiser 27-52145, for 4 Cyl. 3.7L Mercruiser 470

The Sierra 18-0347 is a set of 8 valve stem seals engineered to restore proper oil control at the valve guides on the 4 cyl. 3.7L Mercruiser 470 engine. Valve stem seals wear out over time from heat cycling and contact with the valve stem, letting oil seep down into the combustion chamber or exhaust port; a worn set is a common cause of blue exhaust smoke, fouled plugs, and gradual oil consumption. Sierra manufactures this seal set to meet or exceed original equipment quality, so it installs the same way the original seals did and restores factory sealing performance.

This is a set of 8 seals, enough for a complete single-engine valve stem seal replacement job on the applicable Mercruiser 470 engine. Each unit weighs 0.19 pounds. Sierra part number 18-0347 cross-references directly to the Mercury Marine, OMC, GLM, Mallory, and Volvo Penta part numbers listed below, so it is a straightforward like-for-like replacement whether the engine currently carries an original Mercury/OMC seal or a prior aftermarket equivalent.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0347
• Product Type: Valve Stem Seals
• Quantity: 8 seals per set
• Weight: 0.19 pounds
• UPC: 808282257347
• Engine Fitment: 4 cyl. 3.7L Mercruiser 470
• OEM Cross Reference: Mercury Marine 27-52145, 27-806452, 27-34041; OMC 913277, 912981, 3852693; Volvo Penta 3852693; GLM 32210; Mallory 9-61317

Fitment

• 4 cyl. 3.7L Mercruiser 470

Replaces (OEM)

• GLM 32210
• Mallory 9-61317
• Mercruiser 27-52145
• Mercruiser 27-806452
• Mercruiser 27-34041
• OMC 913277
• OMC 912981
• OMC 3852693
• Volvo Penta 3852693

Frequently Asked Questions

What does the Sierra 18-0347 valve stem seal set include? The Sierra 18-0347 set includes 8 valve stem seals, enough for a full single-engine replacement on the applicable 4 cyl. 3.7L Mercruiser 470 engine.

What engine does part number 18-0347 fit? Sierra 18-0347 is built for the 4 cyl. 3.7L Mercruiser 470 engine.

Is Sierra 18-0347 the same as Mercury Marine 27-52145? Yes, Sierra 18-0347 directly cross-references to Mercury Marine 27-52145, along with Mercury Marine 27-806452 and 27-34041, and installs as a direct replacement.

Does 18-0347 replace OMC valve stem seals? Yes, Sierra 18-0347 cross-references to OMC part numbers 913277, 912981, and 3852693.

Is this compatible with Volvo Penta engines? Sierra 18-0347 cross-references to Volvo Penta part number 3852693.

How many seals come in the 18-0347 set? The set contains 8 valve stem seals, matching a full complement for the 4 cyl. 3.7L Mercruiser 470 engine.

How much does the Sierra 18-0347 seal set weigh? The set weighs 0.19 pounds.

What are the symptoms of worn valve stem seals that 18-0347 addresses? Worn valve stem seals commonly cause blue exhaust smoke, fouled spark plugs, and gradual oil consumption; replacing them with the Sierra 18-0347 set restores proper oil control at the valve guides.

Is Sierra 18-0347 an OEM part or an aftermarket replacement? Sierra 18-0347 is an aftermarket part manufactured to meet or exceed original equipment quality, cross-referenced to the Mercury Marine, OMC, and Volvo Penta OEM numbers it replaces.

Does 18-0347 also cross-reference to GLM or Mallory part numbers? Yes, Sierra 18-0347 cross-references to GLM 32210 and Mallory 9-61317.