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Next: Alfa Romeo 145 FOR SALE
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External
Since: May 01, 2006
Posts: 2
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(Msg. 1) Posted: Wed May 03, 2006 12:55 pm
Post subject: 3.2 liter M30 engine
Archived from groups: alt>autos>bmw (more info?)
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Hi.
I have a 732i 1986 that has some motor problems.
Diagnosis so far:
Engine runs very rough
Changed all spark plugs, no change.
Checked compression on cold engine
Cylinder, Comp
1, 11.5 kg (approx. 165 psi)
2, 0 kg
3, 0 kg
4, 8.5 kg (approx. 125 psi)
5, 8 kg (approx. 120 psi)
6, 10,75(approx. 155 psi)
I'm thinking the head gasket is blown as there is no compression on 2
cylinders next to each other. When I look at specifications for BMW engines
it seems compression should be about 149 psi, so 2 of the cylinders are a
bit hi and the working two others are a bit low, could this be due to broken
piston rings? Allso I have no spec as to how much to tighten this spesific
engine, the book I have lists all other engine types, but I'm hoping I can
use the spec for 733i. Any thoughts on this, anyone?
Best regards
Lars |
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External
Since: Jun 15, 2004
Posts: 87
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(Msg. 2) Posted: Wed May 03, 2006 2:55 pm
Post subject: Re: 3.2 liter M30 engine [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Lars Høiby" <lnewsNo.RemoveThis@spam.hoiby.no> wrote in message
news:4458cf5e$0$22980$c83e3ef6@nn1-read.tele2.net...
> Hi.
> I have a 732i 1986 that has some motor problems.
> Diagnosis so far:
> Engine runs very rough
>
> Changed all spark plugs, no change.
>
> Checked compression on cold engine
> Cylinder, Comp
> 1, 11.5 kg (approx. 165 psi)
> 2, 0 kg
> 3, 0 kg
> 4, 8.5 kg (approx. 125 psi)
> 5, 8 kg (approx. 120 psi)
> 6, 10,75(approx. 155 psi)
>
> I'm thinking the head gasket is blown as there is no compression on 2
> cylinders next to each other. When I look at specifications for BMW
> engines it seems compression should be about 149 psi, so 2 of the
> cylinders are a bit hi and the working two others are a bit low, could
> this be due to broken piston rings? Allso I have no spec as to how much to
> tighten this spesific engine, the book I have lists all other engine
> types, but I'm hoping I can use the spec for 733i. Any thoughts on this,
> anyone?
>
> Best regards
>
> Lars
>
If the compression on the low cylinders increases when you pour some oil
into the head, then the rings are the likely reason. Otherwise, the head
gasket is suspect.
It is no wonder that the engine runs rough. After all two cylinders are not
working at all.
Jim |
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External
Since: Jun 22, 2004
Posts: 981
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(Msg. 3) Posted: Wed May 03, 2006 11:39 pm
Post subject: Re: 3.2 liter M30 engine [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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In article <g166g.11259$Lm5.1466@newssvr12.news.prodigy.com>,
Jim <j.n.RemoveThis@nospam.com> wrote:
> It is no wonder that the engine runs rough. After all two cylinders are
> not working at all.
Depends. Cranking compression testing doesn't tell the full story,
depending on what the problem is. Hence the big variation allowed
while still within spec. At higher revs those cylinders may well do some
work.
--
*OK, who stopped payment on my reality check?
Dave Plowman dave.RemoveThis@davenoise.co.uk London SW
To e-mail, change noise into sound. >> Stay informed about: 3.2 liter M30 engine |
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External
Since: May 01, 2006
Posts: 2
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(Msg. 4) Posted: Thu May 04, 2006 9:01 pm
Post subject: Re: 3.2 liter M30 engine [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Lars Høiby" <lnewsNo DeleteThis @spam.hoiby.no> wrote in message
news:4458cf5e$0$22980$c83e3ef6@nn1-read.tele2.net...
> Hi.
......
Allso I have no spec as to how much to tighten this spesific
> engine, the book I have lists all other engine types, but I'm hoping I can
> use the spec for 733i. Any thoughts on this, anyone?
>
> Best regards
>
> Lars
>
Thank you both for input. Time has not yet allowed me to continue, I'll be
trying again this weekend, I'll keep you updated on the progress
Regards
Lars >> Stay informed about: 3.2 liter M30 engine |
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