Denso alternatory - zalecenie wymiany odpływu wody.pdf

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Product Update Bulletin
Issue date: 07/2015
Technical Information
Alternator
Addressing water leak issues on alternator
In this product bulletin, you will find information about the cause of alternator failure, advice on how to identify
symptoms, as well as corrective actions.
Applicable product
All alternators for Fiat Grande Punto – Punto Evo and Alfa Mito (up to MY2010) with Petrol Engines. Mainly DAN998 for
Fiat Grande Punto, RHD vehicles
DAN998
www.denso-am.eu
Product Update Bulletin | Issue date 07/2015
Page 2/4
Symptom
Alternator failure identified by noisy front bearing caused by water contamination.
Deeper analysis upon disassembling the part highlighted traces of water ingress in the bearing, this in turn has caused
grease deterioration. The bearing rotation under poor lubrication and corrosion has caused fatigue, and resulted in
premature failure of the bearing.
Defective Front Bearing
Cause
Water is introduced through the bulkhead of the engine bay (simulating
water runoff
from the wipers or collected whilst
parked in rainy conditions)
The windshield water drain hose is located directly above the drive belt and alternator pulley. This means that water is
directly dropping onto the alternator front end. Water can then spill into any gaps between the pulley and housing,
especially in static conditions. This in turn creates water stagnation and also frost. Over time this increases the chances
of excessive water ingress in the alternator bearings, resulting in overall failure.
Product Update Bulletin | Issue date 07/2015
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Corrective Actions
Adoption of a new water drain hose to avoid continued water droppage onto the alternator.
1. Increase the length of the existing water drain hose to ensure that it is no longer directly above, or resting on,
the alternator.
BEFORE
AFTER
Product Update Bulletin | Issue date: 07/2015
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2. Replace the small water drain hose with the longer hose similar to the one located in the other draining hole of the
bulkhead.
Required Fiat Parts and Part Numbers are listed below. After replacement, make sure that the new water drain hose
is no longer directed above, or resting on, the alternator.
P/N: 46749072
Adoption of a new water
drain hose to avoid dropping
water on alternator
P/N: 51810013
P/N: 51885638
Adoption of a new water drain
hose to avoid dropping water
on alternator, and resulting
breakage due to frost
DENSO EUROPE B.V.
Hogeweyselaan 165 | 1382 JL Weesp | The Netherlands
Tel. +31 (0)294 - 493 493 | Fax. +31 (0)294 - 417 122
www.denso-am.eu

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