Engine Valve Rotocoils
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Engine Valve Rotocoils

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.

Rotocoil

wdt_ID Engine Model Part No. Description Lock Keeper Application
1 3204 9N0187 ROTOCOIL ASSEM. 2A4429 943 
2 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,
3 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
4 3304, 3306C 1031800 ROTOCOIL AS 2A4429 3304, 3306C
5 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
6 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
7 3406B, 3406C 9Y3329 ROTOCOIL AS 2A4429 3406B, 3406C
8 3406E, 3456, C-15, C-16 4P4962 ROTOCOIL AS 2A4429 D350E II, D400E II, R2900
9 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
10 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

Oil Shields

wdt_ID Engine Model Part No. Description Application
1 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
2 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C 2348776 SHIELD-OIL 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C
3 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
4 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
5 3176, 3176C INF 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
6 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.

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