Alt Water Cooled

Subject:

Radiator Plugged From Corrosion

Part Identifier

Number

8720

Antifreeze may cause plugging and corrosion of the cooling system if it is:

— too old (older than two years or 30,000 miles).

— extremely diluted (mixing ratio).

— not conforming to Porsche specifications.

The coolant or antifreeze used in Porsche vehicles must always conform with the specifications published by Porsche. This information can be found in the 1986 Technical Bulletin Group 1, Number 8629, titled "Corrosion in the Cooling System".

Important Notice

PCNA Technical Bulletins are intended for use by professional technicians, not a "Do-it-yourselfer." They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Special tools may be required io perform certain operations identified in these bulletins. Use of tools and procedures other than those recommended in these bulletins may be detrimental to the safe operation of your vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely, if a condition is described, do not assume that the bufletin applies to your vehicle, or that your vehicle will have that condition. See your Porsche Dealer for information on whether your vehicle may benefit from the information. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify correct part numbers.

© 1987 Porsche Cars North America, Inc.

Page 1 of 1 September 4,1987

928 S4

Group 1

Sill|Ct" Coolant Pump Modified

Part identifier

¿/.-The 928 S4 received a modified coolant mSSP'

SWifisp-:

|||r|rtl engine numbers:

M28/41 M 28/42

MgmW 06736

pKISwpart numbers:

p.wer front belt cover:

928 106 015 13 928 105 564 00 928 105 144 07

Ifeiand beft cover can be reused when facing water pump.

fent pump, Part Number 928106 015 12 JMibwer front belt cover, Part Number 928 05 remain available for cars up to

™fqiWen umbers:

' H 00659 H 06735

M28/41 M28/42

gi.Froni cover, Part Number 928105144 on parts catalog 928S Model '87 ■fa?. Group 1/03/15 picture number 2 is iM'ilable. When ordering a new lower .¿cover, refer to parts numbers listed

#928 106 015 13

#928 106 015 12

#928 106 015 13

#928 106 015 12

Important Notice

^¡Technical Bulletins are intended for use by professional technicians, not a "Do-it-¡M^^tiey are written to inform these technicians of conditions that may occur on ^J^|fl.icies, or to provide information that could assist in the proper service of a vehicle. Bills may be required to perform certain operations identified in these bulletins. Use s and procedures other than those recommended in these bulletins may be detrimental safe operation of your vehicle. Properly trained technicians have the equipment, tools, instructions and know-how to do a job properly and safely. If a condition is described, llplma.that the bulletin applies to your vehicle, or that your vehicle will have that d:i. See your Porsche Dealer for information on whether your vehicle may benefit from ^pai(Fpn. Part numbers listed in these bulletins are for reference only. Always check '%r.'authonzed Porsche dealer to verify correct part numbers.

ggcsehe Cars North America, Inc.

Page 1 of 1 September 4, 1987

928S, 928 S4, 944S

Group 1

Subject: Machining Valve Seats and Checking Valve Guides on 4 Valve Cyl. Heads

Part Identifier

j^ajjlic lifters will not operate properly if Vivalve stem protrudes too high.

fg^Sachining valve seats, distance A and B .¿oV-stom end to cylinder head contact ||fee* for the valve spring retainer) should iilefcieed the following values:

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