OT. volvo "following on"

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Samuel

Guest
Hi all. it's a question about a 1969 volvo i have, ordinary motor. 3 litre
straight 6 with twin stromberg 175cd. I just got her fired up yesterday
after 18 months and a switch from LPG back to petrol and i'm currently
trying to sell it. problem is, after it reaches operating temperature, i try
turning it off and it follows on a disturbing amount. it will cough and
splutter violently for up to 20 seconds before finally coughing itself to
sleep. what could cause it to behave so badly?

i'm fearing carbon build-up in the cylinders which is bad because i really
don't want to lift the head because i can't seem to find a head-gasket for
less than about $aus 150. any ideas?? how effective are those decoking
additives for petrol engines? Thanks for any advice.

Sam.


 
Samuel wrote:
> Hi all. it's a question about a 1969 volvo i have, ordinary motor. 3 litre
> straight 6 with twin stromberg 175cd. I just got her fired up yesterday
> after 18 months and a switch from LPG back to petrol and i'm currently
> trying to sell it. problem is, after it reaches operating temperature, i try
> turning it off and it follows on a disturbing amount. it will cough and
> splutter violently for up to 20 seconds before finally coughing itself to
> sleep. what could cause it to behave so badly?
>
> i'm fearing carbon build-up in the cylinders which is bad because i really
> don't want to lift the head because i can't seem to find a head-gasket for
> less than about $aus 150. any ideas?? how effective are those decoking
> additives for petrol engines? Thanks for any advice.
>
> Sam.
>
>



Check the timing. It may have been 'advanced' it to make it run better
on LPG.
 


Samuel wrote:
>
> Hi all. it's a question about a 1969 volvo i have, ordinary motor. 3 litre
> straight 6 with twin stromberg 175cd. I just got her fired up yesterday
> after 18 months and a switch from LPG back to petrol and i'm currently
> trying to sell it. problem is, after it reaches operating temperature, i try
> turning it off and it follows on a disturbing amount. it will cough and
> splutter violently for up to 20 seconds before finally coughing itself to
> sleep. what could cause it to behave so badly?
>
> i'm fearing carbon build-up in the cylinders which is bad because i really
> don't want to lift the head because i can't seem to find a head-gasket for
> less than about $aus 150. any ideas?? how effective are those decoking
> additives for petrol engines? Thanks for any advice.
>
> Sam.

It sounds like a Volvo 164. If it is the model with the 'thin' bumpers
and the double head lights...
Do not sell it yet. It will be worth a fortune in the near future. At
least in Europe it will.
If it is any other model do not waste your time on the engine. Just
throw it away.....
Erik-Jan.
 

"Brian" <[email protected]> wrote in message
news:[email protected]...
> Samuel wrote:
> > Hi all. it's a question about a 1969 volvo i have, ordinary motor. 3
litre
> > straight 6 with twin stromberg 175cd. I just got her fired up yesterday
> > after 18 months and a switch from LPG back to petrol and i'm currently
> > trying to sell it. problem is, after it reaches operating temperature, i
try
> > turning it off and it follows on a disturbing amount. it will cough and
> > splutter violently for up to 20 seconds before finally coughing itself
to
> > sleep. what could cause it to behave so badly?
> >
> > i'm fearing carbon build-up in the cylinders which is bad because i
really
> > don't want to lift the head because i can't seem to find a head-gasket
for
> > less than about $aus 150. any ideas?? how effective are those decoking
> > additives for petrol engines? Thanks for any advice.
> >
> > Sam.
> >
> >
>
>
>
> Check the timing. It may have been 'advanced' it to make it run better
> on LPG.

Hi Brian. i just set the timing yesterday afternoon, back to the standard 5
BTDC. Why would the timing cause the motor to follow on, just out of
curiosity?

Thanks.


 

"Erik-Jan Geniets" <[email protected]> wrote in message
news:[email protected]...
>
>
> Samuel wrote:
> >
> > Hi all. it's a question about a 1969 volvo i have, ordinary motor. 3
litre
> > straight 6 with twin stromberg 175cd. I just got her fired up yesterday
> > after 18 months and a switch from LPG back to petrol and i'm currently
> > trying to sell it. problem is, after it reaches operating temperature, i
try
> > turning it off and it follows on a disturbing amount. it will cough and
> > splutter violently for up to 20 seconds before finally coughing itself
to
> > sleep. what could cause it to behave so badly?
> >
> > i'm fearing carbon build-up in the cylinders which is bad because i
really
> > don't want to lift the head because i can't seem to find a head-gasket
for
> > less than about $aus 150. any ideas?? how effective are those decoking
> > additives for petrol engines? Thanks for any advice.
> >
> > Sam.
>
> It sounds like a Volvo 164. If it is the model with the 'thin' bumpers
> and the double head lights...
> Do not sell it yet. It will be worth a fortune in the near future. At
> least in Europe it will.
> If it is any other model do not waste your time on the engine. Just
> throw it away.....
> Erik-Jan.

G'day Erik.

Well spotted, it is a 164 and it is the one with the thin bumper and the
side-mirrors that sit out on the wings. it is a beautiful car and in very
good condition, but i can't have it sitting around for all that much longer
and i want the money. I am in Australia, and while it is not worth a fortune
yet, i should be able to get a decent amount for it if a collector decides
they want it. I believe it is the only one exactly like it in Australia, as
the original owners shipped it over from the UK when they migrated.

Sam.


 
Samuel wrote:

>
> Hi Brian. i just set the timing yesterday afternoon, back to the standard 5
> BTDC. Why would the timing cause the motor to follow on, just out of
> curiosity?

Over-advanced ttiming leads to higher combustion chamber temperatures -
thus there's more residual heat to cause pre-ignition (or running on).

A lean mixture can have the same effect, as can a too-high idle speed
(I'd be looking for an idle speed around 700-750 rpm mex). Also a
sticky choke mechanism can cause similar problems.


--
EMB
 

"EMB" <[email protected]> wrote in message
news:[email protected]...
> Samuel wrote:
>
> >
> > Hi Brian. i just set the timing yesterday afternoon, back to the
standard 5
> > BTDC. Why would the timing cause the motor to follow on, just out of
> > curiosity?
>
> Over-advanced ttiming leads to higher combustion chamber temperatures -
> thus there's more residual heat to cause pre-ignition (or running on).
>

Over-retarted timing has a similar effect doesn't it? i might try the timing
in a few different spots and see if theres any improvement.

> A lean mixture can have the same effect, as can a too-high idle speed
> (I'd be looking for an idle speed around 700-750 rpm mex). Also a
> sticky choke mechanism can cause similar problems.
>

while i don't have a tacho, or one of those multi-meters with a tacho, i'm
fairly sure it's about 700, if not less. the carbies have those annoying
non-tamper needles, so i can't adjust the mixture.

Thanks again,

Sam.


 
On Wed, 25 Jan 2006 19:25:33 +1300, EMB <[email protected]> wrote:

>Samuel wrote:
>
>>
>> Hi Brian. i just set the timing yesterday afternoon, back to the standard 5
>> BTDC. Why would the timing cause the motor to follow on, just out of
>> curiosity?
>
>Over-advanced ttiming leads to higher combustion chamber temperatures -
>thus there's more residual heat to cause pre-ignition (or running on).
>
>A lean mixture can have the same effect, as can a too-high idle speed
>(I'd be looking for an idle speed around 700-750 rpm mex). Also a
>sticky choke mechanism can cause similar problems.

Wrong/old spark plugs can have the same effect as well. Try changing
them.

Alex
 
On Wed, 25 Jan 2006 19:25:33 +1300, EMB wrote:

> Also a sticky choke mechanism can cause similar problems.

Or any fuel cut off solenoid that may be sticking open. Though TBH at
that vintage I don't think many petrol engines they had 'em.

--
Cheers [email protected]
Dave. pam is missing e-mail



 


Samuel wrote:

> G'day Erik.
>
> Well spotted, it is a 164 and it is the one with the thin bumper and the
> side-mirrors that sit out on the wings. it is a beautiful car and in very
> good condition, but i can't have it sitting around for all that much longer
> and i want the money. I am in Australia, and while it is not worth a fortune
> yet, i should be able to get a decent amount for it if a collector decides
> they want it. I believe it is the only one exactly like it in Australia, as
> the original owners shipped it over from the UK when they migrated.
>
> Sam.

Hi Sam,
Very nice. Pitty you have to sell it.
Kind regards,
Erik-Jan.
 
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