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Valve Guide Cleaning Reamers
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Overview
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Valve Guide Cleaning Reamers for Continental and Lycoming Engines
McFarlane offers special reamers in the necessary sizes to clean your Continental and Lycoming engine exhaust valves. Standard reamers manufactured for aircraft valve guides are designed to perfect the guide hole size when reaming new guides. The patented McFarlane cleaning reamers have a pilot the same size as the valve stem. This properly sized pilot forces the reamer cutter to start straight and follow the correct valve stem path through the guide hole. Finally, a tool that is designed for the job! While using standard reamers to clean valve guides, you probably have noticed that you have some valve guide metal in the reamer flutes afterwards. This metal is cut from the sides of the guide when hard carbon deposits displace the unguided reamer from the original guide hole, or the reamer was not started in alignment with the guide hole. Wavy or gouged guide holes cause premature carbon buildup, poor heat transfer, and early guide hole wear. Prevent damage to your valve guides by using McFarlane Cleaning Reamers! |
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WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. |
Mfg Notice
- Reference Lycoming Service Instruction 1425A, SSP-1776 and SSP-578 and the appropriate overhaul manual or the appropriate Continental service information to determine which specific valve guide sizes you have and the required reamer size before purchasing the necessary cleaning reamer. Lycoming Mandatory Service Bulletin No. 388C requires exhaust valve guide cleaning every 300 hours for helicopter engines and every 400 hours for all other engines. McFarlane valve guide reamers are for cleaning carbon build-up only and must not be used for finish reaming of new valve guides.
Specifications
| Part Number | Finished Ream Diameter (Corresponds to valve guide ID) | Pilot Diameter (Corresponds to valve stem diameter) |
|---|---|---|
| Lycoming Cleaning Reamers: | ||
| VGR-LC-KT | Contains one of each sized reamer | |
| VGR-LC1 | 0.4040-0.4050 | 0.4012-0.4020 |
| VGR-LC2 | 0.4370-0.4380 | 0.4320-0.4333 |
| VGR-LC3 | 0.4985-0.4995 | 0.4935-0.4945 |
| VGR-LC4 | 0.4995-0.5005 | 0.4957-0.4965 |
| Continental Cleaning Reamers: | ||
| VGR-CN-KT | Contains one of each sized reamer | |
| VGR-CN1 | 0.3750-0.3758 | 0.3715-0.3725 |
| VGR-CN2 | 0.4350-0.4362 | 0.4310-0.4320 |
| VGR-CN3 | 0.4365-0.4375 | 0.4320-0.4330 |
| VGR-CN4 | 0.4370-0.4378 | 0.4325-0.4335 |
| VGR-CN5 | 0.4375-0.4385 | 0.4330-0.4340 |
| VGR-CN6 | 0.3427-0.3435 | 0.3390-0.3400 |
Maintenance Tip
- Lycoming suggest using ordinary cup grease on the flutes of the reamer to remove deposits with the reamer rather than allowing the deposits to fall into the cylinder.
In The Box
- VGR-CN1
- VGR-CN2
- VGR-CN3
- VGR-CN4
- VGR-CN5
- VGR-CN6
Q&A
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
The Mcfarlance catalog shows this kit working for both continental and lycoming engines.