How do I confirm pilotpart032603 fits my machine?

Compare the OEM or reference part number, machine model, engine model, and serial number. You can also submit a fitment inquiry before ordering.

In Stock

For Onan Water Pump

Water Pump 186-6178 for Onan

OEM / REF: 186-6178SKU: pilotpart032603

Water Pump 186-6178 for Onan US Military Generator MEP-802A/MEP-803A Engine is a Water Pump replacement part for Onan Engine Spare Parts, categorized under Engine Spare Parts > Water Pump. Use OEM part number 186-6178 and confirm machine model, engine model, and serial details before checkout.

Stock: In stock
Condition: New
Fitment: Onan Engine Spare Parts
Category: Water Pump

Fitment support before you order
Worldwide delivery options

In stock — ready to order

$149.00USD/EA

Estimated delivery by quantity

Estimated delivery windows
Qty	Estimated delivery
1	Oct 21 – Oct 28
10	Oct 19 – Oct 26
50	Oct 17 – Oct 24

Estimates from today; confirm exact lead time before payment.

Quantity

Buy online now or add to your quote list for bulk pricing and fitment confirmation.

Confirm fitment before ordering →

Lead times can vary by freight route and customs. Contact support for expedited shipping.

Water Pump Description

This Water Pump is indexed for Onan US Military Generator MEP-802A/MEP-803A Engine. Compare reference number 186-6178 against the label on your existing Onan component before ordering.

Before checkout, compare OEM part number 186-6178, connector layout, mounting position, and machine serial number. For high-value or fitment-sensitive parts, submit the fitment form below so support can verify the match.

Part Numbers and Cross References

186-6178

Applications

Onan US Military Generator MEP-802A/MEP-803A Engine

Fitment Notes

Brand or application signal: Onan Engine Spare Parts
Product family: Water Pump
System category: Engine Spare Parts > Lubrication & Cooling Systems > Water Pump
Recommended verification: OEM number, engine model, serial number, old part photos, and dimensions.

Shipping & Returns

Availability: InStock
Shipping: Shipping quotes can be confirmed before payment for heavy or urgent orders.
Returns: Returns are easier when fitment is confirmed before ordering.
B2B support: Bulk, fleet, and repair-shop requests can be handled through the inquiry form.

Frequently Asked Questions

How do I confirm this part fits my machine?

Match the OEM or reference number first, then verify machine model, engine model, serial number, connector layout, mounting points, and old part photos.

Can I order if my part number is not listed?

Yes. Send the old part number, machine plate, and photos through the fitment inquiry form. Support can review possible replacements or alternatives.

Is this an OEM part?

Products are indexed as replacement parts unless explicitly marked otherwise. Always compare reference numbers and confirm fitment before purchase.