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 ModelPart No.DescriptionLock KeeperApplication
32049N0187ROTOCOIL ASSEM.2A4429943
3304, 3304B, 33061W5300ROTOCOIL AS2A4429120B, 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, G33068N7782ROTOCOIL AS2A4429120G, 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, 3306C1031800ROTOCOIL AS2A44293304, 3306C
3406, 3406B, 3406C, 3408, 3408B, 3408C, 3408E, 3412, 3412C, 3412E6N7154ROTOCOIL AS2A442916G, 245, 24H, 5110B, 589, 621, 621B, 621F, 623E, 623F, 627B, 627E, 627F, 631D, 631E, 631G, 633E II, 637D, 637E, 637G, 651E, 657E
3406B, 3406C4W2474ROTOCOIL AS2A442916G, 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, 3406C9Y3329ROTOCOIL AS2A44293406B, 3406C
3406E, 3456, C-15, C-164P4962ROTOCOIL AS2A4429D350E II, D400E II, R2900
3408, 3408B, 3408C, 3412, 3412C, 3412D, 3516B, G3406, G3408, G3408B, G3412, G3412C6N7175ROTOCOIL ASSEMBLY2A4429589, 631E, 637D, 637E, 651E, 657E, 769C, 771C, 773B, 775B, 834B, 988B, 988F, 990, 992C, 992D, D10N, D9N, D9R, PM-565
3408E, 3412E1376500ROTOCOIL AS2A442924H, 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, 3516C1977062ROTOCOIL AS2A44295130B, 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, 3516C1977063ROTOCOIL AS19770555130B, 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, 3516C3165978ROTOCOIL AS2A44295130B, 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, 3516C3165979ROTOCOIL AS19770555130B, 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, G35121976999ROTOCOIL AS2A44295130B, 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, 5230B1333814ROTOCOIL AS2A4429776C, 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, 3196,6I2663ROTOCOIL AS2A4429140H, 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, C181862001ROTOCOIL AS2A442924M, 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, G33063S0461ROTOCOIL2A442912E, 1673B, 951B, 955H, 955K, 977H, 977K, D320A, D4D
D342, D342C, D353C, D364, D375D, D379, D379A, D397D, D398, D398A, G353D, G379, G3987F7666ROTOCAP3B1143D8H, D9E, D9G,
D343, G3434N6761ROTOCOIL ASSEM.2A442916, 1693, 631C, 657B, 666, 768B, 769, 824B, 825B, 826B, 834, 983
D346, D348, D3492S2813ROTOCOIL ASSEM.2A4429641B, 650B, 772, 777, 992, D10
D379B, D398B, D399, G342C, G379, G398, G3997N7639ROTATOR3B1142D8K, D9H
G3512E, G3516C, G3516E, G3520C, G3520E2182935ROTOCOIL AS2A4429PMG3516

Oil Shields

Engine ModelPart No.DescriptionApplication 
3408E, 3412E1376501SHIELD-OIL24H, 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, 3516C2348776SHIELD-OIL3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C
3176B, 3176C, 3196,6I2662SHIELD140H, 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, 3306B6N7174SHIELD-OIL120B, 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, 3176C7E7978SHIELD14M, 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, G3998N7780SHIELD-OIL12G, 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.