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PostPosted: Wed Oct 04, 2017 9:08 am 
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So I took my 1988 Alfa 75 3.0 V6 for a 5 minute drive up and down a lane. A very easy drive, no high revs. I’ve finally got the car running on 6 cylinders after an air leak through a fuel injector caused a misfire.

The car was running fine (finally) but when I stopped driving and left it idling for a few minutes, it was running rough and wouldn’t rev with a fair amount of throttle. I turned the car off for a few minutes and when I came to start it, the engine wouldn’t turn. The lights dimmed and the fan slow down when turning the key, which lead me to believe the starter was engaging. After a couple of tries the start just made a ‘machine gun’ type rapid clicking noise.

Before the drive, I noticed a rapid coolant leak when the engine was running coming from the water pump/ thermostat area. However there was sufficient coolant in the reservoir before and after the drive. My initial thoughts (lost sleep over this) were that the engine had overheated and seized due to bad coolant flow. The engine felt very hot, the fan was blowing warm air (so radiator had heat) and the waterpipes were too hot to touch (wouldn’t this mean coolant was flowing?). The fan was blowing throughout the duration of the drive and idle (because I’ve hard wired it on – waiting for new fan switch).


Anyway, since this bad day, I’ve returned to the car and managed to turn the engine by hand. I’ve fully charged the battery and the engine started with no fuss. What could have happened here? The were no signs of overheating - the oil temp gauge was at 50/60°C: could this suggest a fault? Seems low. Although as I said, the fan was on all the time.

Since cooling, this leak is now very rapid even with engine not running.

Any help would be appreciated.

Thanks,
Jack


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PostPosted: Wed Oct 04, 2017 9:17 am 
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I cannot give any insight into the starting issues but it does sound like the water pump seal has gone and it might be seized. Is a new one easy to find at reasonable cost? The leaking coolant could have caused an electrical issue?

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PostPosted: Wed Oct 04, 2017 10:18 am 
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Are the battery and alternator ok?

If the alternator is shot and the battery voltage was low it could explain the poor idling and inability to turn the engine over afterwards.

Having to fully (re)charge the battery is a clue......

Measure the battery voltage - should be around 12V (12.6 would be good). Start the engine and it should rise to around 14V - proving the alternator is working.

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PostPosted: Wed Oct 04, 2017 11:34 am 
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if the water pump has gone it may of dumped water on the alternator

by the sounds of it, the car has been sitting for a while, what is never good for seals and rubber parts, it will need a full service and fluid change


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PostPosted: Wed Oct 04, 2017 6:53 pm 
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:dunno: I'm surprised that an Alfa that old isn't rusted away by now :hiding:

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PostPosted: Wed Oct 04, 2017 7:06 pm 
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That did cross my mind wine-o, that said there where improvements by the late 80's but the electrics where always the death nail

iirc wasn't the 75 the rwd with the gearbox on the back axle ? very over engineered (reads heavy)


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