Heater Bypass Pipe On Side Of Cylinder Head

If you need something, try asking for it here - you never know
pgp001
Minor Fan
Posts: 489
Joined: Sun Aug 27, 2017 6:05 pm
MMOC Member: Yes

Heater Bypass Pipe On Side Of Cylinder Head

Postby pgp001 » Fri Jun 12, 2020 7:51 pm

I am looking for the copper heater bypass Pipe that fastens on the studs on the offside of the cylinder head.
This pipe carries the heater water along the side and across the front of the engine, and connects to the bottom hose.

It is for a 1969 1098 engine.

Thanks
Phil

peterdjon
Minor Friendly
Posts: 14
Joined: Fri Jun 17, 2011 12:48 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby peterdjon » Fri Jun 12, 2020 10:38 pm

There's one on eBay at the moment, not much time left.
https://www.ebay.co.uk/itm/Morris-Minor ... SwXYZe3NBV

pgp001
Minor Fan
Posts: 489
Joined: Sun Aug 27, 2017 6:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby pgp001 » Fri Jun 12, 2020 11:23 pm

Hi

Yes I have seen that one thanks, but although the price is OK it is not the one I am after.
It is this type that goes over the thermostat housing and along the head near the spark plugs.

https://www.ebay.co.uk/itm/Morris-Minor ... SwCPheovEe

I am a bit reluctant to pay that sort of money for one though. It is only for my spare engine.

Thanks
Phil

philthehill
Minor Maniac
Posts: 7691
Joined: Thu Jul 19, 2012 12:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby philthehill » Sat Jun 13, 2020 7:58 am

Not cheap but they rarely come up for sale.

You can always make an offer!

https://www.ebay.co.uk/itm/Morris-Minor ... SwCPheovEe


jagnut66
Minor Legend
Posts: 2515
Joined: Fri Apr 11, 2008 7:28 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby jagnut66 » Sat Jun 13, 2020 12:21 pm

Hi,
The disadvantage of the later heater pipe is that it fastens down via the head studs, which has the effect of compromising your head gasket whenever you remove it.
The earlier one is (IMO) a better design, as it is held in position by the exhaust studs, so you don't need to disturb the head gasket should you need to remove the pipe to make a repair or alteration that doesn't necessarily involve the engine block itself.
This puts those seeking originality above all else at a disadvantage, as (IMO) they are forced to accept a bad choice of pipe routing.
Which leads me to wonder if this design alteration was done to try to persuade motorists of the time to use 'official' mechanics, rather than doing the work themselves at home?
Or is that just my natural cynicism coming through...... :wink:
Best wishes,
Mike.
1954 Series 2 on axle stands needing more welding......

pgp001
Minor Fan
Posts: 489
Joined: Sun Aug 27, 2017 6:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby pgp001 » Sat Jun 13, 2020 12:28 pm

I plan on double nutting the two studs where it attaches and trapping the pipe brackets between the nuts for that very reason.

Phil

jagnut66
Minor Legend
Posts: 2515
Joined: Fri Apr 11, 2008 7:28 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby jagnut66 » Sat Jun 13, 2020 12:40 pm

Fair enough Phil, though I would fit the earlier design in preference myself.
Two different schools of thought obviously but then that's what keeps this site interesting. :D
Best wishes,
Mike.
1954 Series 2 on axle stands needing more welding......

pgp001
Minor Fan
Posts: 489
Joined: Sun Aug 27, 2017 6:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby pgp001 » Sat Jun 13, 2020 3:22 pm

I am just trying to keep my spare engine with the exact same layout as the one in the car, so it will be a "plug & play" straight swap when I eventually get to fit it.

Phil

Trickydicky
Minor Legend
Posts: 1546
Joined: Fri Aug 05, 2011 9:53 pm
MMOC Member: No

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby Trickydicky » Sat Jun 13, 2020 5:00 pm

If I remember correctly the pipe is 15 mm copper pipe and should be easy to fabricate. If you can't flare the pipe at each end you could solder a olive on each end to form the flare.
Richard

Opinions are like people,everyone can be different.

mobylette
Minor Fan
Posts: 180
Joined: Sat Feb 13, 2010 5:02 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby mobylette » Sat Jun 13, 2020 5:20 pm

The pipe is ~ 13mm (just measured mine) which is the old 1/2 inch. but I don't suppose anyone would spot the difference if you made one up out of 15mm .The 1/2" pipe is available here:

https://www.midlandchandlers.co.uk/prod ... tre-pc-009

pgp001
Minor Fan
Posts: 489
Joined: Sun Aug 27, 2017 6:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby pgp001 » Sat Jun 13, 2020 7:34 pm

All sorted now thanks, club spares has come up with the one I need at a very reasonable price.

Phil

pgp001
Minor Fan
Posts: 489
Joined: Sun Aug 27, 2017 6:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby pgp001 » Wed Jun 17, 2020 10:35 pm

I have just been making some longer short studs for the ones where the heater bypass pipe fits, I used some of the long ones and re-cut the threads to suit.
One of my pet hates is split dies, they are OK for cleaning muck out of threads etc, but for making new threads I always use a Coventry die head in the lathe.
It occurred to me that some people might not know what one of those is, so just a couple of photos showing how I set it up on the Myford.

Image

Image

This setup gives a superb quality and very strong thread form that cannot be distinguished from an original stud.

Phil

philthehill
Minor Maniac
Posts: 7691
Joined: Thu Jul 19, 2012 12:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby philthehill » Thu Jun 18, 2020 7:43 am

If there is not enough stud to support the head nut, the heater pipe brackets, washer and nut use the stepped female/male adapter (Pt No: AAA3694) used for mounting the 948cc oil bath air cleaner. Remove the original head nut fit the adapter, the heater pipe, the washers and original head nut.

As an aside - I use one of these for cutting threads in the lathe

https://www.ebay.co.uk/itm/RDG-2-MT-TAI ... XQPatTKV1Z

I have modified a Eclipse No: 143 tap holder to fit the above die holder so have the best of both worlds.


dudload
Minor Fan
Posts: 340
Joined: Tue Sep 01, 2015 10:37 am
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby dudload » Thu Jun 18, 2020 11:13 am

seems strange that these aren't made by any of the major suppliers. i guess not exactly a part that wears out, but fairly key in keeping the engine cool and driver warm if anything does happen to it!

pgp001
Minor Fan
Posts: 489
Joined: Sun Aug 27, 2017 6:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby pgp001 » Wed Jun 24, 2020 11:25 pm

Slight change of plan............

When I started to measure up properly I realised that if I perched the pipe higher up on top of the cylinder head nuts, that it would end up not reaching the outlet stub on the bottom hose without bending it.
So I have come up with another solution that allows the pipe to be easily removed without disturbing the head nuts.

Image

Image

Image

I am going to use one of my longer short studs for the corner where the steady bar fits instead.

Phil

philthehill
Minor Maniac
Posts: 7691
Joined: Thu Jul 19, 2012 12:05 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby philthehill » Thu Jun 25, 2020 10:23 am

For information and future reference:-

The head stud that is used for the engine steady bracket is a one off stud specifically for use with the engine steady bracket and is either Pt No: 51K244 or 51K254.


jagnut66
Minor Legend
Posts: 2515
Joined: Fri Apr 11, 2008 7:28 pm
MMOC Member: Yes

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby jagnut66 » Thu Jun 25, 2020 11:05 am

That's a very inventive solution to what must be a common issue for owners of later cars.
Who'd have thought that such a simple thing, as this heater pipe and its routing, could provoke so much discussion.
The thing I still don't understand though (unless I go down the cynical route), is why they moved it from the exhaust stud mountings, to the opposite side of the engine and mounted on the head studs (of all things) in the first place. :roll:
Best wishes,
Mike.
1954 Series 2 on axle stands needing more welding......

ManyMinors
Minor Legend
Posts: 1758
Joined: Tue Nov 11, 2014 9:41 am
MMOC Member: No

Re: Heater Bypass Pipe On Side Of Cylinder Head

Postby ManyMinors » Thu Jun 25, 2020 12:23 pm

I cannot think of any logical reason for changing it either. The later design makes it harder to remove the thermostat. I prefer the earlier arrangement.


Who is online

Users browsing this forum: No registered users and 2 guests