101 Exhaust manifolds.

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T

Thingy_wotsit

Guest
Morph is still in bits and the heads are at the local machine shop for
reworking... stud holes for manifolds and valves replaced and ground is as
required with new valve guides too.

Anyway, while Morph ois stripped down I was pondering the issue of the poor
quality exhaust manifolds.

If my recollection is correct it's the Left hand manifold which cracks.

At the risk of sounding thicker than custard.... which is the left hand
manifold. I have two depending on where I stand looking at the engine ;)

Also if I was to remove said manifold would it be worth getting it machined
to ensure flushness of each of the ports or would this really be puching
oned luck and destined to fracture it in the process.

I'm looking at prevention of future problems here.

I've got a full set of gaskets which I believe will assit partly in the
existing potential problems being avoided. Do I just fit these and keep
everything crossed?

Lee D
--

www.lrproject.com
Toy list--
'76 101 Field Cafe "Morph"
'64 88" IIa V8 Auto "Percy"
'97 Disco ES Auto LPG'd "Oscar"
'01 Laguna


 
In message <[email protected]>
"Thingy_wotsit" <[email protected]> wrote:

> Morph is still in bits and the heads are at the local machine shop for
> reworking... stud holes for manifolds and valves replaced and ground is as
> required with new valve guides too.
>
> Anyway, while Morph ois stripped down I was pondering the issue of the poor
> quality exhaust manifolds.
>
> If my recollection is correct it's the Left hand manifold which cracks.
>
> At the risk of sounding thicker than custard.... which is the left hand
> manifold. I have two depending on where I stand looking at the engine ;)
>

Left-hand and right-hand are always from the point of view someone sitting
in the drivers seat looking forward as far as LR are concerned.

> Also if I was to remove said manifold would it be worth getting it machined
> to ensure flushness of each of the ports or would this really be puching
> oned luck and destined to fracture it in the process.
>
> I'm looking at prevention of future problems here.
>
> I've got a full set of gaskets which I believe will assit partly in the
> existing potential problems being avoided. Do I just fit these and keep
> everything crossed?
>
> Lee D

Richard
--
www.beamends-lrspares.co.uk [email protected]
Running a business in a Microsoft free environment - it can be done
Powered by Risc-OS - you won't get a virus from us!!
Boycott the Yorkshire Dales - No Play, No Pay
 
On Wed, 2 Nov 2005 01:30:39 -0000, "Thingy_wotsit"
<[email protected]> wrote:

>If my recollection is correct it's the Left hand manifold which cracks.

Yeah, and the right one... :-(

>At the risk of sounding thicker than custard.... which is the left hand
>manifold. I have two depending on where I stand looking at the engine ;)

Cars are like boats, Port (Left) is the bit on your left as you drive
/ sail it - Not as you're looking at it standing at the front looking
in. I found this out once, to my cost, after removing the wrong head.

>Also if I was to remove said manifold would it be worth getting it machined
>to ensure flushness of each of the ports or would this really be puching
>oned luck and destined to fracture it in the process.

Use the gaskets :)

I did think about machining them miself, but TBH, it's prolly not
worth the hassle.



--
"We have gone from a world of concentrated knowledge and wisdom to one
of distributed ignorance. And we know and understand less while being
increasingly capable." Prof. Peter Cochrane, formerly of BT Labs
In memory of Brian {Hamilton Kelly} who logged off 15th September 2005
 
On or around Wed, 02 Nov 2005 09:46:36 +0000, Mother <"@ {mother}
@"@101fc.net> enlightened us thusly:

>Cars are like boats, Port (Left) is the bit on your left as you drive
>/ sail it - Not as you're looking at it standing at the front looking
>in. I found this out once, to my cost, after removing the wrong head.

Just don't apply the same rule of the road. Unless you're in forn parts, of
course.


(nautical rule of the road is "pass other vessels to port")
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Would to God that we might spend a single day really well!"
Thomas À Kempis (1380 - 1471) Imitation of Christ, I.xxiii.
 
The problem with the manifolds is they they are machined too soon after
casting. Apparantly cast iron should be left for 6 months or so before
machining. If you were to carefully measure you will find the port
faces will be slightly out of true. We looked at re-machining them but
due to the shape of the manifolds it's very difficult to set up. Use
manifold gaskets as suggested above and don't over tighten.

Sean
73FL74 101GS
1984 110 2.5NA
Medway Military Vehicle Group
www.mmvg.net

 
Mother wrote:

>>Also if I was to remove said manifold would it be worth getting it machined
>>to ensure flushness of each of the ports or would this really be puching
>>oned luck and destined to fracture it in the process.
>
>
> Use the gaskets :)
>
> I did think about machining them miself, but TBH, it's prolly not
> worth the hassle.
>

Skimming 'em would be a 30 second job, CLAMPING them to skim them would
take hours....

Steve
 
In news:[email protected],
Austin Shackles <[email protected]> blithered:
> On or around Wed, 02 Nov 2005 09:46:36 +0000, Mother <"@ {mother}
> @"@101fc.net> enlightened us thusly:
>
>> Cars are like boats, Port (Left) is the bit on your left as you drive
>> / sail it - Not as you're looking at it standing at the front looking
>> in. I found this out once, to my cost, after removing the wrong
>> head.
>
> Just don't apply the same rule of the road. Unless you're in forn
> parts, of course.
>
>
> (nautical rule of the road is "pass other vessels to port")

So you drive on the right Austin? Thought itwas a bit hairy in WAles!

--
"He who says it cannot be done should not interrupt her doing it."

If at first you don't succeed,
maybe skydiving's not for you!


 
"Steve Taylor" <[email protected]> wrote in message
news:[email protected]...
> Mother wrote:
>
>>>Also if I was to remove said manifold would it be worth getting it
>>>machined to ensure flushness of each of the ports or would this really be
>>>puching oned luck and destined to fracture it in the process.
>>
>>
>> Use the gaskets :)
>>
>> I did think about machining them miself, but TBH, it's prolly not
>> worth the hassle.
>>
>
> Skimming 'em would be a 30 second job, CLAMPING them to skim them would
> take hours....
>
> Steve

Yeah, my thoughts too. Best let sleeping dogs lie I reckon. Thanks folks!

Lee D


 
[email protected] wrote:
> The problem with the manifolds is they they are machined too soon after
> casting. Apparantly cast iron should be left for 6 months or so before
> machining.

Or thermally cycled up to red heat and back a few times - it relieves
the casting stresses in the iron.

If you were to carefully measure you will find the port
> faces will be slightly out of true. We looked at re-machining them but
> due to the shape of the manifolds it's very difficult to set up. Use
> manifold gaskets as suggested above and don't over tighten.
Thinking about it, If I were to do one, I'd probably cast it onto a
fixture with low melting point alloy, then skim, reheat in an oven and
release the parts.....Its do-able that way, and you don't fart about
trying to level everything properly. The LMP does it for you.

Steve
 
On or around Wed, 2 Nov 2005 12:35:51 -0000, "GbH"
<[email protected]> enlightened us thusly:

>In news:[email protected],
>Austin Shackles <[email protected]> blithered:
>> On or around Wed, 02 Nov 2005 09:46:36 +0000, Mother <"@ {mother}
>> @"@101fc.net> enlightened us thusly:
>>
>>> Cars are like boats, Port (Left) is the bit on your left as you drive
>>> / sail it - Not as you're looking at it standing at the front looking
>>> in. I found this out once, to my cost, after removing the wrong
>>> head.
>>
>> Just don't apply the same rule of the road. Unless you're in forn
>> parts, of course.
>>
>>
>> (nautical rule of the road is "pass other vessels to port")
>
>So you drive on the right Austin? Thought itwas a bit hairy in WAles!

no, I drive on the left, therefore oncoming vehicles (should have been an
"oncoming" in the first bit, I admit) are on my right, i.e. to starboard.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Festina Lente" (Hasten slowly) Suetonius (c.70-c.140) Augustus, 25
 
On or around Wed, 02 Nov 2005 11:10:33 +0000, Steve Taylor
<[email protected]> enlightened us thusly:

>Mother wrote:
>
>>>Also if I was to remove said manifold would it be worth getting it machined
>>>to ensure flushness of each of the ports or would this really be puching
>>>oned luck and destined to fracture it in the process.
>>
>>
>> Use the gaskets :)
>>
>> I did think about machining them miself, but TBH, it's prolly not
>> worth the hassle.
>>
>
>Skimming 'em would be a 30 second job, CLAMPING them to skim them would
>take hours....

Find a sod-off surface plate and set to with some grinding paste?

I once did an alloy head like that.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"Festina Lente" (Hasten slowly) Suetonius (c.70-c.140) Augustus, 25
 
Austin Shackles wrote:

> Find a sod-off surface plate and set to with some grinding paste?
>
> I once did an alloy head like that.

God, you masochist.

Steve
 
Steve Taylor wrote:
>
> Skimming 'em would be a 30 second job, CLAMPING them to skim them would
> take hours....

Go and find an engine rebuilder who has a manifold grinding machine (no
clamping required) - he shouldn't charge a lot to surface one unless
it's very badly warped.

--
EMB
 
Austin Shackles <[email protected]> uttered summat worrerz
funny about:
>> Skimming 'em would be a 30 second job, CLAMPING them to skim them
>> would take hours....
>
> Find a sod-off surface plate and set to with some grinding paste?
>
> I once did an alloy head like that.

Done it on a water gallery on the VM engine... that took forever using 800
grit (massive roll I was given).

Did the lob though.
I think my arms may drop off first doing it on cast.

Lee D


 
In news:[email protected],
Austin Shackles <[email protected]> blithered:
> On or around Wed, 2 Nov 2005 12:35:51 -0000, "GbH"
> <[email protected]> enlightened us thusly:
>
>> In news:[email protected],
>> Austin Shackles <[email protected]> blithered:
>>> On or around Wed, 02 Nov 2005 09:46:36 +0000, Mother <"@ {mother}
>>> @"@101fc.net> enlightened us thusly:
>>>
>>>> Cars are like boats, Port (Left) is the bit on your left as you
>>>> drive / sail it - Not as you're looking at it standing at the
>>>> front looking in. I found this out once, to my cost, after
>>>> removing the wrong head.
>>>
>>> Just don't apply the same rule of the road. Unless you're in forn
>>> parts, of course.
>>>
>>>
>>> (nautical rule of the road is "pass other vessels to port")
>>
>> So you drive on the right Austin? Thought itwas a bit hairy in WAles!
>
> no, I drive on the left, therefore oncoming vehicles (should have
> been an "oncoming" in the first bit, I admit) are on my right, i.e.
> to starboard.

That's what I thought, but your description implied road and water were the same,
but here you suggest otherwise.
Of course, Paddy was going to holiday in America and he practiced before going and
decided it was blooming dangerous!

--
"He who says it cannot be done should not interrupt her doing it."

If at first you don't succeed,
maybe skydiving's not for you!


 
EMB wrote:

> Go and find an engine rebuilder who has a manifold grinding machine (no
> clamping required) - he shouldn't charge a lot to surface one unless
> it's very badly warped.
>

Is this like a bloody big linisher ?

Steve
 
Steve Taylor wrote:
> EMB wrote:
>
>> Go and find an engine rebuilder who has a manifold grinding machine
>> (no clamping required) - he shouldn't charge a lot to surface one
>> unless it's very badly warped.
>>
>
> Is this like a bloody big linisher ?

Effectively, although they generally have a rotating stone set into a
flat tabletop.

--
EMB
 
EMB wrote:

>> Is this like a bloody big linisher ?
>
>
> Effectively, although they generally have a rotating stone set into a
> flat tabletop.
>

Not seen one of those. Is the manifold offered up by hand then ?

Steve
 
Steve Taylor wrote:
> EMB wrote:
>
>>> Is this like a bloody big linisher ?
>>
>>
>>
>> Effectively, although they generally have a rotating stone set into a
>> flat tabletop.
>>
>
> Not seen one of those. Is the manifold offered up by hand then ?

It is - but it takes about 5 minutes to make a suitable bracket to bolt
to the outlet studs to hold it at an appropriate angle if you're really
worried about not being able to hold it true.



--
EMB
 
On or around Wed, 02 Nov 2005 18:33:21 +0000, Steve
<[email protected]> enlightened us thusly:

>Austin Shackles wrote:
>
>> Find a sod-off surface plate and set to with some grinding paste?
>>
>> I once did an alloy head like that.
>
>God, you masochist.

It was only about 8 thou out, and 4 thou was allowable. I think I got it
down to about 3 thou, and it worked - new gasket sealed and stayed sealed.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"The breezy call of incense-breathing Morn, The swallow twittering
from the strawbuilt shed, The cock's shrill clarion, or the echoing
horn, No more shall rouse them from their lowly bed."
Thomas Gray, Elegy Written in a Country Churchyard.
 
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