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--001a11400ee604a067053b8596a1
Hi Richard, thank you so much for your post it solved for me a longstanding
Healey mystery!!
In the early '80s we had an elderly customer bring in a low mileage BN4
that had lost all oil pressure.
We found exactly the symptoms that you describe but I never knew the the
cause..
As I recall we installed a new cam and oil pump to resolve the problem but
I had always wondered why it had happened to this carefully driven low
mileage engine..
I'll sleep better tonight :-)
Michael S
BN1 #174
On Thu, Sep 1, 2016 at 9:30 PM, richard mayor <boyracer466@gmail.com> wrote:
> Chris,
>
> I hate to be negative about your good oil pressure but I fear you may have
> a problem. I am assuming that you have the "high pressure" oil pump from
> DW.
>
> Based upon that assumption, I can tell you that it is the rotary style of
> pump that was used on the 100-6 engines. There were many problems with this
> pump. It has a very large capacity and as such it results in a lot of
> friction, or back pressure in the system. Namely, it put stress on the
> camshaft gear, the driving spindle gear, the timing chain and the camshaft
> thrust plate. This was a common problem with the early 100-6 motors. One
> fix was to machine an oil grove in one side of the the trust plate. Then an
> oil groove on both sides. Then a bronze thrust plate with oil grooves.
> Timing chains stretched. Cam and driving spindle gears received excessive
> wear. That is why the switch was made to the gear style pump.
>
> The rotary style of pump is actually a very good design. Nissan used it in
> the Z car motors but it was 2/3rd the size of the Healey pump so there was
> much less back pressure.
>
> Many of us racers have used the DW "high pressure" oil pumps and
> discovered that at some point, all of the teeth on the cam and driving
> spindles have been ground off to such an extent that we have lost all oil
> pressure. On a shelf with my "offerings to the god of speed" I have a
> camshaft thrust plate that has a groove that has been ground into it
> almost 1/8th of an inch from the resistance of the oil pump forcing the
> camshaft into the trust plate. I am sad to admit that it took me the loss
> of 2 race motors to finally grasp why this was happening and before I
> switched back to the 3000 gear style pump .
>
> Jeff Jonk did an excellent article about these pumps and the damage they
> cause in the Healey Marque publication about 10 years ago.
>
> Richard
>
> On Tue, Aug 30, 2016 at 3:53 AM, Chris Dimmock <austin.healey@gmail.com>
> wrote:
>
>> Hi all,
>> Recently someone asked about oil pressures, and the oil being used.
>>
>> My BJ8 engine was totally rebuilt in 1998.
>> Today, my wife and I went for a drive up the M1 motorway and I kept an
>> eye on oil pressure. Water temp was 185 degrees all the time. Air temp was
>> ~22 degrees Celcius.
>> Lovely day for a drive to the Hunter Valley!
>>
>> Hot idle. After 70 minutes at ~70 mph, idle @ 850 - 900rpm = 40 lbs.
>> Oil pressure at 2,000 rpm hot driving = 50 lbs
>> 3,000 - 5,000 rpm hot oil pressure = 60 lbs.
>> My wife said we wouldn't make our 3rd wedding anniversary if I pulled
>> 6,000 in overdrive top..... ;-)
>> Denis Welch oil pump.
>> Fresh Penrite HPR 40 oil and filter last weekend.
>> Draw your own conclusions. Mine are:
>> the thermostat is perfect, and
>> so is the oil pressure relief valve.
>> Best
>> Chris
>>
>> _______________________________________________
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>>
>>
>
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>
>
--
*If you can't fix it with a hammer, you've got an electrical problem.*
--001a11400ee604a067053b8596a1
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Hi Richard, thank you so much for your po=
st it solved for me a longstanding Healey mystery!!<br></div><div class=3D"=
gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:smal=
l">In the early '80s we had an elderly customer bring in a low mileage =
BN4 that had lost all oil pressure. <br></div><div class=3D"gmail_default" =
style=3D"font-family:comic sans ms,sans-serif;font-size:small">We found exa=
ctly the symptoms that you describe but I never knew the the cause.. <br></=
div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-se=
rif;font-size:small">As I recall we installed a new cam and oil pump to res=
olve the problem but I had always wondered why it had happened to this care=
fully driven low mileage engine..<br></div><div class=3D"gmail_default" sty=
le=3D"font-family:comic sans ms,sans-serif;font-size:small">I'll sleep =
better tonight :-)<br></div><div class=3D"gmail_default" style=3D"font-fami=
ly:comic sans ms,sans-serif;font-size:small">Michael S<br></div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small">BN1 #174<br></div></div><div class=3D"gmail_extra"><br><div class=3D=
"gmail_quote">On Thu, Sep 1, 2016 at 9:30 PM, richard mayor <span dir=3D"lt=
r"><<a href=3D"mailto:boyracer466@gmail.com"; target=3D"_blank">boyracer4=
66@gmail.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div d=
ir=3D"ltr"><div><div><div>Chris,<br><br></div>I hate to be negative about y=
our good oil pressure but I fear you may have a problem.=C2=A0 I am assumin=
g that you have the "high pressure" oil pump from DW.<br><br>Base=
d upon that assumption, I can tell you that it is the rotary style of pump =
that was used on the 100-6 engines. There were many problems with this pump=
.=C2=A0 It has a very large capacity and as such it results in a lot of fri=
ction, or back pressure in the system. Namely, it put stress on the camshaf=
t gear, the driving spindle gear, the timing chain and the camshaft thrust =
plate.=C2=A0 This was a common problem with the early 100-6 motors.=C2=A0 O=
ne fix was to machine an oil grove in one side of the the trust plate. Then=
an oil groove on both sides. Then a bronze thrust plate with oil grooves.=
=C2=A0 Timing chains stretched.=C2=A0 Cam and driving spindle gears receive=
d excessive wear.=C2=A0 That is why the switch was made to the gear style p=
ump.<br><br>The rotary style of pump is actually a very good design. Nissan=
used it in the Z car motors but it was 2/3rd the size of the Healey pump s=
o there was much less back pressure.=C2=A0 <br><br></div>Many of us racers =
have used the DW "high pressure" oil pumps and discovered that at=
some point, all of the teeth on the cam and driving spindles have been gro=
und off to such an extent that we have lost all oil pressure.=C2=A0 On a sh=
elf with my "offerings to the god of speed" I have a camshaft thr=
ust plate that has a groove that has been ground into it almost=C2=A0 1/8th=
of an inch from the resistance of the oil pump forcing the camshaft into t=
he trust plate. I am sad to admit that it took me the loss of 2 race motors=
to finally grasp why this was happening and before I switched back to the =
3000 gear style pump .<br><br></div><div>Jeff Jonk did an excellent article=
about these pumps and the damage they cause in the Healey Marque publicati=
on about 10 years ago.<br><br></div><div></div>Richard<br><div><div><br><di=
v><div class=3D"gmail_extra"><div class=3D"gmail_quote"><span class=3D"">On=
Tue, Aug 30, 2016 at 3:53 AM, Chris Dimmock <span dir=3D"ltr"><<a href=
=3D"mailto:austin.healey@gmail.com"; target=3D"_blank">austin.healey@gmail.c=
om</a>></span> wrote:<br></span><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span cl=
ass=3D"">Hi all,<br>
Recently someone asked about oil pressures, and the oil being used.<br>
<br>
My BJ8 engine was totally rebuilt in 1998.<br>
Today, my wife and I went for a drive up the M1 motorway and I kept an eye =
on oil pressure. Water temp was 185 degrees all the time. Air temp was ~22 =
degrees Celcius.<br>
Lovely day for a drive to the Hunter Valley!<br>
<br>
Hot idle. After 70 minutes at ~70 mph, idle @ 850 - 900rpm =3D 40 lbs.<br>
Oil pressure at 2,000 rpm hot driving =3D 50 lbs<br>
3,000 - 5,000 rpm hot oil pressure =3D 60 lbs.<br>
My wife said we wouldn't make our 3rd wedding anniversary if I pulled 6=
,000 in overdrive top..... ;-)<br>
Denis Welch oil pump.<br>
Fresh Penrite HPR 40 oil and filter last weekend.<br>
Draw your own conclusions. Mine are:<br>
the thermostat is perfect, and<br>
so is the oil pressure relief valve.<br>
Best<br>
Chris<br>
<br>
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team.net/mailman/<wbr>options/healeys/boyracer466@gm<wbr>ail.com</a><br>
<br>
</blockquote></div><br></div></div></div></div></div>
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<a href=3D"http://autox.team.net/mailman/listinfo/healeys"; rel=3D"noreferre=
r" target=3D"_blank">http://autox.team.net/mailman/<wbr>listinfo/healeys</a=
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s/michaelsalter@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://auto=
x.team.net/mailman/<wbr>options/healeys/michaelsalter@<wbr>gmail.com</a><br=
>
<br>
<br></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail=
_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div d=
ir=3D"ltr"><i><font size=3D"2"><span style=3D"color:black">If you can't=
fix it with a hammer, you've got an electrical problem.</span></font><=
/i><br><br><div></div><div></div><div></div></div></div></div></div>
</div>
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