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The impeller is an important part of the cooling system.

Inside the impeller pump housing is a neoprene impeller that rotates in a round house. There are rubber lips on the impeller that press against the wall of the pump housing. Due to the speed of the impeller, the rubber lips are pressed against the walls of the pump housing, creating a number of chambers. In the housing of the impeller pump there is a "comb" in which the rubber lips are pressed inwards when the pump is turned, thereby changing the volume of the chamber (it becomes smaller). After passing the "comb" the rubber lip bends out again and the chamber becomes larger again, this causes a suction and in this way the pump sucks the water. The sucked up water is then forced out through the outlet.

The impeller must be replaced every few years and preferably removed during a winter break to extend the life of the impeller.

Replace impeller.

Replacing the impeller is very easy if you follow the step-by-step plan below.

Step 1.

Remove the impeller pump cover by loosening the screws.

Step 2.

Take two screwdrivers and put some tape around them so that you cannot damage the pump housing when you pop out the impeller with the screwdrivers. with a water pump pliers it is also possible to pull out the impeller.

Step 3.

Clean the pump housing and check for wear (deep grooves). If these are there and you had cooling problems then the pump should be replaced, the same goes for the impeller cover.
In some cases, you can turn the lid over once you've removed the paint and continue for a while. The letters that often appear on the lid have no influence on the capacity of the pump, so you can turn the lid over if possible.

Pump housing.

Pump housing cover with deep grooves and it must be replaced or turned over, this may be an emergency solution.

You can buy a new lid in the web shop of this site.

Front of the lid, which can be turned over in an emergency once the paint has been removed.

Step 4.

Lubricate the pump housing and the impeller with some petroleum jelly and replace the impeller with a ty-rap around it, this makes it easier to insert the impeller. An impeller has no front or rear, but make sure that the impeller blades point in the correct direction when it is installed. The Try-rap tips are mainly intended for large impellers, but with small impellers this is not necessary.

Step 5.

Secure the impeller with the screw again and replace the cover with a new gasket on the pump.

Replace impeller and reinstall cover.

Below is a list of impellers that you can purchase from the site's web store.

Impeller 7401
Arona AD185
Bukh DV20, DV20M
Farymann K30M,
Perkins M20 Perama

Impeller 7402
Arona AD182L/M, AD190, AD190/195M, AD195M, AD295,
Beta Marie 20.
BMW D7, D12
Bukh DV8ME/SME, DV10LME/LSME, DV10M, DV10ME/SME,DV10LME/LSME
Farymann A30M, A40M, FK2, K34, 15W, 18W, 32W, L30M
Lombardini LDW401M
Nanni Diesel K34, L30,
Ruggerini MM150, MM191, PM105, RD100/2, RD100/951, RDM901, RM80, Rm90
Volvo Penta MD1, MD2, MD3, MD5, MD6, MD7, MD11, MD17
Volvo Penta 2001, 2002, 2003

Impeller 7403
BMW D35. D50
Beta Marine BD722, BD1005, BF2803, BV1305B, BV1505, BV1903, BV2203, BZ482,
Lombardini LDW1503M, LDW2004M
Nanni Diesel 2.40HE, 2.50HE, 2.50HE, 3.75HE, 3.90HE, P30, R30
Ruggerini MM351
Vetus M2.05, M3.10, M205, M310, M4.14

Impeller 7404
BMW B130.
Bukh DV36ME/SME, DV48ME/SME
DAF DF615MY
Farymann FK3, P30m, R30M, S30M
Ford 2400, 2722, 2401E, 2700 Turbo, 2701E, 2704E, 2711E, 2713E, 2714E,
Ford Lehman 4D50, 4D61
Lister Petter LPW2, LPW3, LPW4
Mercedes OM636, OM314,
Nanni Diesel 3.110HE, 3.100HE, 4.110HE4.110L,4.15HE,4.190HE, 4.330TDI, 4.180, MB180, MB220, MB300, MB300, M200, M240, M275,
Perkins 4.107Mll, 4.108, 4.108MLL, 4.236,4.236, 4.236T, 4.236LL, 4.99M, 4.99M,
Vetus M4.14, P4.25
Volvo Penta 2-55, 2-75,

Impeller 7405
DAF DP680M,DS575m, DT575MY, DT615MY
BMW B190, B220, D150, D190, D530TA, S636TA
Lombardini LDW2004 Turbo
Beta Marine BSD333,BSD678,
Ford 2723, 2725, 2726T, 2726TIM, 2726TM, 2728TIM
Mercedes OM352, OM355, 360, 401, 402, OM403, OM404
Nanni Diesel 5.280HE,6.280HE, 4.230, 4240, 4.380,5.300T, 5.570 6, 6.570T, 5250TEI
Perkins 6.305, 6.354, 6.3543, 6.354DM, 6.HD135
Volvo Penta AQAD30, AQAD41, AD31, AD41,
Volvo Penta KAD32, KAD42, KAD43, KAD44,
Volvo Penta MD30, TAMD31,MD32, MD40, TMD40, TMD41, MD42, MD50, MD70, MD100, MD120

Impeller 7407
Nanni Diesel D2840LE, D2842LE, D2842LXE, D2842LYE, D2845LE, D2866LE, D2866TE, 2100, 2100T.

Impeller 7409
Arona AD290,
Bukh DV20ME/SME
D1-13, D1-20, 1-30, D2-40,
LombardiniLDW502M, LDW602M, LDW702M, LDW903M, LDW1003M, LDW1204m, LDW1204 Turbo, LDW1404M,
Perkins M25, M30, 3HD30M35, M40, M50, M60, M80T Prima, M90, V8.510
Ruggerini RM270
Volvo Penta MD21,
Volvo Penta MD2010, MD2020, MD2030, MD2040

Impeller 7410
Peugeot Indenor DTP40, DTP50, DTP62,
Volvo Penta MD22

Impeller 7429
DAF DK1160MY, DKS1160M, DKT1160,DKV1160M,DVKD1160M
Mercedes OM424
Nanni Diesel 1300,1600