Morris Minor Forum
No Compression in #3
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Biddulph, Staffs, UK
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A valve stuck open if you are lucky 
Take the rocker box off and
check both valves are coming up properly
Fingers crossed 4 u
Take the rocker box off and
check both valves are coming up properly
Fingers crossed 4 u
In reply to # 17575 by ptownmorrisman
I was already to get on to a fuel pump project (spurred on by Geezer) when I found the car suddenly running very poorly. The engine/exhaust noise was kind of fluttering, and idle was just hanging on. I just did a compression check and get ZERO in #3. The others are 170, 160, and 155.
I presume that I'll have to pop the head off, but any ideas what I might find? Could it be as simple as a head gasket?
I presume that I'll have to pop the head off, but any ideas what I might find? Could it be as simple as a head gasket?
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Took the head off and found that the exhaust valve of #3 isn't fully seating. I can get a fingernail in the gap. All the other valves are tight to the head. I don't have a way to compress the spring, so I'll probably take it to a machine shop.
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 Adelaide, South Australia, Australia
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May 11, 2016 07:56 PM
Top Contributor
 Joined 12 years ago
324 Posts
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Biddulph, Staffs, UK
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The machine shop I used to use,
which was run by a long time friend,
always advised me against fitting hardened seats
because the seats pop out occasionally
Which does the engine a whole lot
of no good
Another friend, who ran a very big Harley agency
reckoned the answer was to use a rusting agent
between the new seat, and the old head,
He recommended a disinfectant that stained the skin red.
unfortunately, we can't get that disinfectant any more in the UK
(
which was run by a long time friend,
always advised me against fitting hardened seats
because the seats pop out occasionally
Which does the engine a whole lot
of no good
Another friend, who ran a very big Harley agency
reckoned the answer was to use a rusting agent
between the new seat, and the old head,
He recommended a disinfectant that stained the skin red.
unfortunately, we can't get that disinfectant any more in the UK
(
In reply to # 17589 by little red rollerskate
Fit hardened seats while you're in there so you don't have to worry about unleaded fuel.
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Biddulph, Staffs, UK
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Not too bad then Owen
May I suggest you get your head lightly skimmed while it's in the machine shop
May I suggest you get your head lightly skimmed while it's in the machine shop
In reply to # 17585 by ptownmorrisman
Thanks, Phillip.
I did take it to a machine shop, and the guy saw that the valve guide had slipped down so the valve couldn't seat. He also saw that the guide for the neighboring #2 valve had ridden up. He'll get it straight, and I'll be back on the road soon.
I did take it to a machine shop, and the guy saw that the valve guide had slipped down so the valve couldn't seat. He also saw that the guide for the neighboring #2 valve had ridden up. He'll get it straight, and I'll be back on the road soon.
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Adelaide, South Australia, Australia
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May 12, 2016 02:18 AM
Top Contributor
Joined 12 years ago
324 Posts
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Hmm, sixteen years ago, I had hardened seats fitted to the head of my MGB (as part of a complete engine rebuild). They were still there and working well thirteen years later and last I heard from the new owner, still working well. I'd be wary of that advice, though there may be other reasons not to fit hardened seats.
In reply to # 17592 by 0123
The machine shop I used to use,
which was run by a long time friend,
always advised me against fitting hardened seats
because the seats pop out occasionally
Which does the engine a whole lot
of no good
Another friend, who ran a very big Harley agency
reckoned the answer was to use a rusting agent
between the new seat, and the old head,
He recommended a disinfectant that stained the skin red.
unfortunately, we can't get that disinfectant any more in the UK(
which was run by a long time friend,
always advised me against fitting hardened seats
because the seats pop out occasionally
Which does the engine a whole lot
of no good
Another friend, who ran a very big Harley agency
reckoned the answer was to use a rusting agent
between the new seat, and the old head,
He recommended a disinfectant that stained the skin red.
unfortunately, we can't get that disinfectant any more in the UK
(
In reply to # 17589 by little red rollerskate
Fit hardened seats while you're in there so you don't have to worry about unleaded fuel.
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Biddulph, Staffs, UK
Sign in to contact
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One swallow . . .
In reply to # 17594 by little red rollerskate
Hmm, sixteen years ago, I had hardened seats fitted to the head of my MGB (as part of a complete engine rebuild). They were still there and working well thirteen years later and last I heard from the new owner, still working well. I'd be wary of that advice, though there may be other reasons not to fit hardened seats.
In reply to # 17592 by 0123
The machine shop I used to use,
which was run by a long time friend,
always advised me against fitting hardened seats
because the seats pop out occasionally
Which does the engine a whole lot
of no good
Another friend, who ran a very big Harley agency
reckoned the answer was to use a rusting agent
between the new seat, and the old head,
He recommended a disinfectant that stained the skin red.
unfortunately, we can't get that disinfectant any more in the UK(
which was run by a long time friend,
always advised me against fitting hardened seats
because the seats pop out occasionally
Which does the engine a whole lot
of no good
Another friend, who ran a very big Harley agency
reckoned the answer was to use a rusting agent
between the new seat, and the old head,
He recommended a disinfectant that stained the skin red.
unfortunately, we can't get that disinfectant any more in the UK
(
In reply to # 17589 by little red rollerskate
Fit hardened seats while you're in there so you don't have to worry about unleaded fuel.
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Biddulph, Staffs, UK
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There's some guff here about replacing valve seats.
It gives you some idea of the questions you might wish to ask
before you set a machine shop on to replace your seats.
If you decide to go that way
Replacing an OK seat has never made any sense to me.
An eroded seat yes
An Ok seat no
http://www.enginebuildermag.com/2009/04/valve-seats-machining-guide/
Edited 1 time(s). Last edit at 2016-05-12 03:00 AM by 0123.
It gives you some idea of the questions you might wish to ask
before you set a machine shop on to replace your seats.
If you decide to go that way
Replacing an OK seat has never made any sense to me.
An eroded seat yes
An Ok seat no
http://www.enginebuildermag.com/2009/04/valve-seats-machining-guide/
Edited 1 time(s). Last edit at 2016-05-12 03:00 AM by 0123.
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Biddulph, Staffs, UK
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Yeah, that figures Phillip.
Valves that have been run on leaded fuel
harden themselves and their seats
while they run on leaded fuel.
When you have valves and seats machined,,
and sometimes when you simply grind valves in,
you cut though the hardening
so you have no choice but to fit new seats
during any valve job
Valves that have been run on leaded fuel
harden themselves and their seats
while they run on leaded fuel.
When you have valves and seats machined,,
and sometimes when you simply grind valves in,
you cut though the hardening
so you have no choice but to fit new seats
during any valve job
In reply to # 17597 by 66jalopy
I had the do a valve job on mine, no new seats two years later I had burnt exhaust valves. Now I have new hardened seats
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