[Alpines] Over Heating

[tom.hill at att.net]

If you remove the head, inspect the water passage area on the head closely.  The Alpine head is known for galvanic corrosion in this area.  If the head if sufficiently eroded, the head gasket won't seal.  When I removed my cylinder head for a rebuild, I found a buildup of crud in the passages.  After cleaning it out, the head gasket wouldn't seal anymore.

Also, regarding gauge and/or sending unit issues, the gauge gets power from the instrument power regulator under the dash.  If the regulator is getting "fritzy", it could goof up the gauge reading.

Good Luck,

Tom Hill
-------------- Original message from Tony Somebody <achd73 at yahoo.com>: -------------- 


> There are no leaks, The radiator has been pressure and 
> > flow tested OK,the water pump checks OK, good flow in top 
> > tank, with or without the thermostat installed. 
> 
> 
> Phil Have you checked compression? Usually when an engine overheats it is from the before mentioned problems. SO, if the water pump is pumping and the problem continuses after the thermostat is changed and you say the radiator is flowing(has it ever been rodded out?)- the heat has to be coming from the engine- usually a blown head gasket. When a head gasket blows one or two things happen. ONE- water gets into the oil or two- compression gets into the water. Since you arent losing water (antifreeze mixture) and if the gasket is blown then compression would have to be heating up the water. When you shut the engine off- Do you hear a gurgurling sound? Like the water is boiling inside the engine- does so until the temp drops down?? If not and a compression test shows 
> the same pressure on all cylinders, I would start thibking about finding another 
> gauge oand or sending unit. Have you used a heat gun( that measures temps) on 
> the outside of the engine to know what 
> the engine temp is ambient wise? 
> Im getting at if you have no other signs of a problem besides the gauge you need 
> to prove to yourself the engine is hot. Does it boil over or bypass the radiator 
> cap? Does the engine ping from it getting to hot to drive? IF NO to all 
> questions- go make sure it is really hot and not just the gauge or sending unit 
> showing hot. Good luck. 
> TtT 
> 
> 
> --- On Tue, 2/3/09, philipreddy at fuse.net wrote: 
> 
> > From: philipreddy at fuse.net 
> > Subject: [Alpines] Over Heating 
> > To: "alpines at autox.team.net" 
> > Date: Tuesday, February 3, 2009, 9:09 AM 
> > My series III has developed an over heating problem. I have 
> > owned the Alpine for 35 years and renew the antifreeze 
> > regularly and have never had this problem until this past 
> > year. There are no leaks, The radiator has been pressure and 
> > flow tested OK,the water pump checks OK, good flow in top 
> > tank, with or without the thermostat installed. 
> > 
> > I am looking for suggestions on how to proceed from here. 
> > 
> > Phil Reddy 
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