[Mgs] Running hot

Max Heim mvheim at sonic.net
Mon Feb 1 11:43:36 MST 2021

I have had a plastic fan blade break and puncture the radiator. I think this was rather a fringe case, however. Autopsy revealed the fan had a molding flaw — there was large bubble in the plastic right at the base of the blade that broke off — it only lasted 307 miles from new. Also, it is doubtful that the blade would have seriously damaged the radiator if it hadn’t become trapped in the radiator shroud. As it was, it acted as a kind of rotary hammer, which was too much for the 50+ year-old brass core.

Anyway, as for Rick’s problem, if it doesn’t involve a head gasket leak (as suggested), then I think that leaves serious blockage in the block somewhere. Possibly this could be located with a thermo gun. I have had to remove freeze plugs and break up deposits with a pick in an old iron block V8 before.

Max Heim
'66 MGB

> On Feb 1, 2021, at 10:18 AM, Charles Robinson <ccrobins at ktc.com> wrote:
> I had a metal fan blade on my '69 B break loose at speed on the highway.  It punctured the radiator.  That's the only time the car ever stranded me.
> CR
> On 1/31/2021 12:54 PM, h.duinhoven at planet.nl wrote:
>> That's an interesting piece of information!
>> So now I have to find an MG dealer, who can deliver me a plastic fan.
>> My 1971 imported in 1990 to the Netherlands from California still has the
>> metal blades...
>> I once read a story of a broke metal fan blade protruding through the bonnet
>> (hood).
>> Cheers,
>> Hans
>> 71 BGT
>> -----Oorspronkelijk bericht-----
>> Van: Mgs <mgs-bounces at autox.team.net> Namens Robert's New iPad
>> Verzonden: zondag 31 januari 2021 01:51
>> Aan: rolindsay at yahoo.com
>> CC: MGs <mgs at autox.team.net>
>> Onderwerp: Re: [Mgs] Running hot
>>     In 1972, MG issued a service bulletin that said all the cars with metal
>> fans should have them replaced by the dealer, at no cost, by the plastic
>> fan.   When I came across the bulletin, a couple of years back, I bought a
>> plastic fan and replaced the metal one.
>>    Plastic fan seems to move more air and to be quieter too. As I always
>> keep fan belt very loose, I found its lower weight reduced squeal when
>> jabbing the throttle.
>>    If the electric fan moves more air than the OEM metal one, why not remove
>> the metal one?   Unless the two are moving air at exactly the same velocity,
>> one fan will be interfering with the other, not enough to cause this
>> overheating, but unnecessary.
>> Bob
>>> On Jan 30, 2021, at 7:04 PM, rolindsay at yahoo.com wrote:
>>>> Is fan turning the right direction? I have heard about that but
>>>> never seen it.
>>>    I verified that the metal fan is mounted correctly. And verified that
>> the electric fan that I mounted is blowing the right way (the second time I
>> wired it :-).
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