The function of a Rotocoil is to rotate the valve on each open and close cycle. By rotating the valve, it prevents excessive carbon build up and the valve wears uniformly preventing loss of compression.
Rotocoil rotating the valves result in:
- Uniform heat distribution
- Uniform wear of the valves and seats
- Cleans deposits out from between the valve and seat
- Helps keep the valve from overheating
When valves stop rotating it can result in:
- Deposits being trapped between the valve and seat
- Overheating, weakening, and failure of the valve
- Creates hot spots on the valve face
- Loss of compression
- Accelerated guide and valve wear
- Valves sticking in the guides
- Broken Valves
Most OE manufacturers do not recommend reusing rotocoils. Turning a rotocoil by hand is no indication of its functionality. Most new rotocoils will not turn freely or smoothly when turned by hand. Rotocoils should be replaced when an engine is overhauled.
Rotocoils
| Engine Model | Part No. | Description | Lock Keeper | Application |
|---|---|---|---|---|
| 3204 | 9N0187 | ROTOCOIL ASSEM. | 2A4429 | 943 |
| 3304, 3304B, 3306 | 1W5300 | ROTOCOIL AS | 2A4429 | 120B, 120G, 12G, 12H, 12H ES, 12H NA, 130G, 140B, 140G, 140H, 140H ES, 140H NA, 143H, 14G, 14H NA, 160G, 160H, 160H ES, 160H NA, 163H NA, 1673C, 215, 215B, 215C, 235, 235B, 330, 330 L, |
| 3304, 3304B, 3306, 3306B, G3306 | 8N7782 | ROTOCOIL AS | 2A4429 | 120G, 12G, 130G, 140B, 140G, 14G, 225, 235, 330 L, 330B, 518, 528, 572G, 637D, 815B, 920, 930, 936F, 950, 950B, 951B, 955L, 963, 966C, 966D, 966R, 977L, D4E, D4E SR, D5B, D5H |
| 3304, 3306C | 1031800 | ROTOCOIL AS | 2A4429 | 3304, 3306C |
| 3406, 3406B, 3406C, 3408, 3408B, 3408C, 3408E, 3412, 3412C, 3412E | 6N7154 | ROTOCOIL AS | 2A4429 | 16G, 245, 24H, 5110B, 589, 621, 621B, 621F, 623E, 623F, 627B, 627E, 627F, 631D, 631E, 631G, 633E II, 637D, 637E, 637G, 651E, 657E |
| 3406B, 3406C | 4W2474 | ROTOCOIL AS | 2A4429 | 16G, 16H NA, 375, 375 L, 5080, 578, 583R, 587R, 621E, 621F, 623E, 623F, 627E, 627F, 814B, 824G, 825G, 826G, 980C, 980F, 980G, D350E, D400E, D8N, D8R, D8R II, HT400, PM-465, RM-250C |
| 3406B, 3406C | 9Y3329 | ROTOCOIL AS | 2A4429 | 3406B, 3406C |
| 3406E, 3456, C-15, C-16 | 4P4962 | ROTOCOIL AS | 2A4429 | D350E II, D400E II, R2900 |
| 3408, 3408B, 3408C, 3412, 3412C, 3412D, 3516B, G3406, G3408, G3408B, G3412, G3412C | 6N7175 | ROTOCOIL ASSEMBLY | 2A4429 | 589, 631E, 637D, 637E, 651E, 657E, 769C, 771C, 773B, 775B, 834B, 988B, 988F, 990, 992C, 992D, D10N, D9N, D9R, PM-565 |
| 3408E, 3412E | 1376500 | ROTOCOIL AS | 2A4429 | 24H, 5110B, 631D, 631E, 631G, 633E II, 637E, 637G, 651E, 657E, 69D, 769C, 769D, 771D, 773B, 773D, 773E, 775B, 775D, 775E, 834B, 836, 844, 988B, 988F II, 990, 990 II, 992C, AD40, AD45 |
| 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C | 1977062 | ROTOCOIL AS | 2A4429 | 5130B, 5230, 5230B, 776C, 776D, 777, 777B, 777C, 777D, 784C, 785, 785B, 785C, 785D, 789B, 789C, 793B, 793C, 793D, 797, 797B, 854G, 992G, 994 |
| 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C | 1977063 | ROTOCOIL AS | 1977055 | 5130B, 5230, 5230B, 776C, 776D, 777, 777B, 777C, 777D, 784C, 785, 785B, 785C, 785D, 789B, 789C, 793B, 793C, 793D, 797, 797B, 854G, 992G, 994 |
| 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C | 3165978 | ROTOCOIL AS | 2A4429 | 5130B, 5230, 5230B, 776C, 776D, 777, 777B, 777C, 777D, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793B, 793C, 793D, 797, 797B, 854G |
| 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C | 3165979 | ROTOCOIL AS | 1977055 | 5130B, 5230, 5230B, 776C, 776D, 777, 777B, 777C, 777D, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793B, 793C, 793D, 797, 797B, 854G |
| 3508, 3508B, 3508C, 3512, 3512B, 3516, 3516B, G3508, G3508B, G3512 | 1976999 | ROTOCOIL AS | 2A4429 | 5130B, 5230, 5230B, 776C, 776D, 777, 777D, 784C, 785, 785B, 785C, 789B, 789C, 793B, 793C, 797, 797B, 854G, 992G, 994, 994D, D11R |
| 3508, 3508B, 3512, 3512B, 3516, 3516B, 5130, 5130B, 5230, 5230B | 1333814 | ROTOCOIL AS | 2A4429 | 776C, 776D, 777, 777D, 784B, 785, 785B, 785C, 789B, 789C, 793B, 793C, 854G, 992G, 994, 994D, D11N, D11R, G3508, G3512, G3516, G3516B |
| C10, 3176, 3176B, 3176C, 3196, | 6I2663 | ROTOCOIL AS | 2A4429 | 140H, 143H, 14H, 160H, 163H, 16H, 345B, 345B II, 345B II MH, 345B L, 365B, 365B II, 365B L, 480, 572R II, 65E, 725, 730, 75C, 75D, 75E, 814F, 815F, 816F, 85C, 85D, 85E, 95E |
| C15, C18 | 1862001 | ROTOCOIL AS | 2A4429 | 24M, 3406E, 3456, 365C, 365C L, 365C L MH, 374D L, 374F L, 385B, 385C, 385C FS, 385C L, 385C L MH, 390D, 390D L, 390F L, 5090B, 583T, 587T, 621B, 621G, 623G, 627F, 627G, 631D, 631E, 631G, 633E II, 637 |
| D333B, G3306 | 3S0461 | ROTOCOIL | 2A4429 | 12E, 1673B, 951B, 955H, 955K, 977H, 977K, D320A, D4D |
| D342, D342C, D353C, D364, D375D, D379, D379A, D397D, D398, D398A, G353D, G379, G398 | 7F7666 | ROTOCAP | 3B1143 | D8H, D9E, D9G, |
| D343, G343 | 4N6761 | ROTOCOIL ASSEM. | 2A4429 | 16, 1693, 631C, 657B, 666, 768B, 769, 824B, 825B, 826B, 834, 983 |
| D346, D348, D349 | 2S2813 | ROTOCOIL ASSEM. | 2A4429 | 641B, 650B, 772, 777, 992, D10 |
| D379B, D398B, D399, G342C, G379, G398, G399 | 7N7639 | ROTATOR | 3B1142 | D8K, D9H |
| G3512E, G3516C, G3516E, G3520C, G3520E | 2182935 | ROTOCOIL AS | 2A4429 | PMG3516 |
Oil Shields
| Engine Model | Part No. | Description | Application | |
|---|---|---|---|---|
| 3408E, 3412E | 1376501 | SHIELD-OIL | 24H, 5110B, 631D, 631E, 631G, 633E II, 637E, 637G, 651E, 657E, 769C, 769D, 771D, 773B, 773D, 773E, 775B, 775D, 775E, 834B, 836, 844, 988B, 988F II, 990, 990 II, 992C, C30, C32, D10N | |
| 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C | 2348776 | SHIELD-OIL | 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C | |
| 3176B, 3176C, 3196, | 6I2662 | SHIELD | 140H, 143H, 14H, 160H, 163H, 16H, 345B, 345B II, 345B II MH, 345B L, 365B, 365B II, 365B L, 480, 572R II, 65E, 725, 730, 75C, 75D, 75E, 814F, 815F, 816F, 85C, 85D, 85E, 95E, 966G I | |
| 3304, 3304B, 3306, 3306B | 6N7174 | SHIELD-OIL | 120B, 120G, 12G, 12H, 12H ES, 12H NA, 130G, 140B, 140G, 140H, 140H ES, 140H NA, 143H, 14G, 14H NA, 160G, 160H, 160H ES, 160H NA, 163H NA, 1673C, 215C, 235, 235B, 330, 330 L | |
| 3176, 3176C | 7E7978 | SHIELD | 14M, 16M, 345C, 345C L, 345C MH, 345D, 345D L, 345D L VG, 349D, 349D L, 349E, 349E L, 349E L HVG, 349E L VG, 349F L, 621H, 621K, 623H, 623K, 623K LRC, 627H, 627K, 627K LRC, 725, 730, 730C | |
| D379B, G399 | 8N7780 | SHIELD-OIL | 12G, 920, 941, D4E, D5B |
* Other part no. not included in the list are available. Please contact your sales representative if you have any questions. Part Numbers are used for reference purposes only.
