24 Jun 2004 16:26:54
Barret Bonden
how to patch hole in water jacket of engine

Have a small hole in the water jacket of my inboard gas engine; this is
sea water cooled, so of low pressure. How to patch ? I've drilled it and it
will now it will take a 3/8 bolt. I've thought of placing a large washer and
the bolt in the hole, using a silicone gasket maker like to seal it, and
then perhaps to cover it all with a "cold weld" epoxy made for bonding
metals - any thoughts ?




24 Jun 2004 17:06:43
taz
Re: how to patch hole in water jacket of engine


"Barret Bonden" <support@41north.net > wrote in message
news:ihDCc.25053$Y3.22663@newsread2.news.atl.earthlink.net...
> Have a small hole in the water jacket of my inboard gas engine; this is
> sea water cooled, so of low pressure. How to patch ? I've drilled it and
it
> will now it will take a 3/8 bolt. I've thought of placing a large washer
and
> the bolt in the hole, using a silicone gasket maker like to seal it, and
> then perhaps to cover it all with a "cold weld" epoxy made for bonding
> metals - any thoughts ?
>
>




24 Jun 2004 17:12:33
taz
Re: how to patch hole in water jacket of engine

Sorry about above post. It does help if you
add the text before hitting send. Taz.


How did the hole occurr in the first place
and how thick is the wall of the jacket.
If you have drilled a 3/8 hole in there can you tap
the hole and just seal a bolt in with a washer.
If you can't tap it can you gain access to both sides
to bolt and seal with washers. If it is low pressure
water then just the bolt and a seal should be enough.
The sealing compound on the outside will be overkill
if the bolt and washer work ok.
taz.




24 Jun 2004 17:39:33
Barret Bonden
Re: how to patch hole in water jacket of engine

Taz -

Kind of you to reply -

The how of the matter is best avoided .a valve was added to the back of the
exhaust system after a following sea flooded the engine; this valve was NOT
opened when someone started the engine, and the pressure blew out a small
drain plug.

The thickness in this part of the water jacket is perhaps 1/8 inch or
less .no rust, but a ragged hole was made; I bored out the hole with a
grinding attachment to a hand drill - still a bit rough , but it does accept
a 3/8 bolt; it threads on , so there's some mechanical holding there - not
enough thickness to the wall to tap, I would think - can't gain access to
both sides without removing the water jacket ; this is an old engine , and I
picture most of the bolts falling apart , along with much of my sailing
season - my hope is to patch it for the summer .but I've got to trust it .



"taz" <taz24taz24@blueyonder.co.uk > wrote in message
news:5YDCc.1728$%K2.16694424@news-text.cableinet.net...
> Sorry about above post. It does help if you
> add the text before hitting send. Taz.
>
>
> How did the hole occurr in the first place
> and how thick is the wall of the jacket.
> If you have drilled a 3/8 hole in there can you tap
> the hole and just seal a bolt in with a washer.
> If you can't tap it can you gain access to both sides
> to bolt and seal with washers. If it is low pressure
> water then just the bolt and a seal should be enough.
> The sealing compound on the outside will be overkill
> if the bolt and washer work ok.
> taz.
>
>




24 Jun 2004 19:13:22
Nigel
Re: how to patch hole in water jacket of engine


"Barret Bonden" <support@41north.net > wrote in message
news:ihDCc.25053$Y3.22663@newsread2.news.atl.earthlink.net...
> Have a small hole in the water jacket of my inboard gas engine; this is
> sea water cooled, so of low pressure. How to patch ? I've drilled it and
it
> will now it will take a 3/8 bolt. I've thought of placing a large washer
and
> the bolt in the hole, using a silicone gasket maker like to seal it, and
> then perhaps to cover it all with a "cold weld" epoxy made for bonding
> metals - any thoughts ?
>
>

For a temporary fix could you use one of the hole wall fixing thingamies to
bolt a patch over the hole. there quite a range of them in the
ironmongers/diy shops.






24 Jun 2004 19:54:28
Tony of Judicious
Re: how to patch hole in water jacket of engine

Barret Bonden wrote:

> Have a small hole in the water jacket of my inboard gas engine; this is
> sea water cooled, so of low pressure. How to patch ? I've drilled it and
> it will now it will take a 3/8 bolt. I've thought of placing a large
> washer and the bolt in the hole, using a silicone gasket maker like to
> seal it, and
> then perhaps to cover it all with a "cold weld" epoxy made for bonding
> metals - any thoughts ?

Sounds OK providing there is an adequate wall thickness.

Don't use silicone, it is horrible. Would think a soft copper washer would
be better. Epoxy over the top is overkill, also epoxy degrades at hot
water temperatures.




24 Jun 2004 21:56:35
taz
Re: how to patch hole in water jacket of engine


"Barret Bonden" <support@41north.net > wrote in message
news:plECc.25104$Y3.23066@newsread2.news.atl.earthlink.net...
> Taz -
>
> Kind of you to reply -
> The thickness in this part of the water jacket is perhaps 1/8 inch or
> less .no rust, but a ragged hole was made; I bored out the hole with a
> grinding attachment to a hand drill - still a bit rough , but it does
accept
> a 3/8 bolt; it threads on , so there's some mechanical holding there - not
> enough thickness to the wall to tap, I would think - can't gain access to
> both sides without removing the water jacket ; this is an old engine , and
I
> picture most of the bolts falling apart , along with much of my sailing
> season - my hope is to patch it for the summer .but I've got to trust it .
>

If the metal in the area is sound and if you know a friendly
welder, the hole could be welded closed. If no welder is available
then I would be tempted and try to seal the hole with just a bolt.
As you said there is no pressure in the water so with a good
nylon or copper type washer it should be ok.
Somebody earlier suggested using a wall fixing type screw.
There is a good one available that when it is used the action
of the bolt ( normally a metric M6 ) collapses are spiders web
of galvanised steel into the hole. You then take out the bolt and fix
whatever you want to it, In your case I would suggest a great big
washer with an even bigger peace of rubber infront of it. Tighten it
all up ant the rubber will fill all the recesses and seal the hole.
Good luck taz.




25 Jun 2004 08:33:12
Tony Brooks
Re: how to patch hole in water jacket of engine


"Tony of Judicious" <tony@deletethis.thoward.plus.com > wrote in message
news:koFCc.21056$NK4.3482384@stones.force9.net...
> Barret Bonden wrote:
>
> > Have a small hole in the water jacket of my inboard gas engine; this
is
> > sea water cooled, so of low pressure. How to patch ? I've drilled it
and
> > it will now it will take a 3/8 bolt. I've thought of placing a large
> > washer and the bolt in the hole, using a silicone gasket maker like to
> > seal it, and
> > then perhaps to cover it all with a "cold weld" epoxy made for bonding
> > metals - any thoughts ?
>
> Sounds OK providing there is an adequate wall thickness.
>
> Don't use silicone, it is horrible. Would think a soft copper washer
would
> be better. Epoxy over the top is overkill, also epoxy degrades at hot
> water temperatures.
>
FWIW If all else fails I think you could use one of, what I know of as,
Devcon products - a sort of high class "body filler", heavily loaded with
metal. Not much of a recmendation , but BMC (shows how long ago - so it
should have got better) suppled it as a factory approved mod for faulty
castings.

Tony Brooks




25 Jun 2004 09:01:08
Keith
Re: how to patch hole in water jacket of engine

In message <n6ICc.2017$l75.19569889@news-text.cableinet.net >, taz
<taz24taz24@blueyonder.co.uk > writes
>"Barret Bonden" <support@41north.net> wrote in message
>news:plECc.25104$Y3.23066@newsread2.news.atl.earthlink.net...
>>
>> The thickness in this part of the water jacket is perhaps 1/8 inch or
>> less .no rust, but a ragged hole was made; I bored out the hole with a
>> grinding attachment to a hand drill - still a bit rough , but it does
>accept
>> a 3/8 bolt; it threads on , so there's some mechanical holding there - not
>> enough thickness to the wall to tap, I would think - can't gain access to
>> both sides without removing the water jacket ; this is an old engine , and
>I
>> picture most of the bolts falling apart , along with much of my sailing
>> season - my hope is to patch it for the summer .but I've got to trust it .
>>
>
>If the metal in the area is sound and if you know a friendly
>welder, the hole could be welded closed. If no welder is available
>then I would be tempted and try to seal the hole with just a bolt.
>As you said there is no pressure in the water so with a good
>nylon or copper type washer it should be ok.

Welding cast iron is not a good solution, in my opinion. Can require
pre-heating of cylinder block

As you have little pressure to contend with I suggest you use your
'interference fit' bolt and 'Araldite' it in. Scrupulously clean
surfaces,
of course.. choose the appropriate formula mix from the Araldite range.

Years ago - when I raced sports cars - we successfully turned the
engine through 90 degrees and 'dry sumped' it. (1)

This caused steam pockets in the cylinder head - we drilled, threaded
and Araldited steel tube water outlets into the head and connected
these
to the cooling system. Never leaked.

(1) Lowered COG... err, Centre of Gravity..
--
Keith replace nospam with ilf0rd


25 Jun 2004 10:11:03
Ian Johnston
Re: how to patch hole in water jacket of engine

On Fri, 25 Jun 2004 08:01:08 UTC, Keith <keith@nospam.demon.co.uk >
wrote:

: Welding cast iron is not a good solution, in my opinion. Can require
: pre-heating of cylinder block

What about Lumiweld sticks? Never used them myself, but I think there
are fairly low temperature ones for cast iron...

Ian


--



26 Jun 2004 06:39:29
Keith
Re: how to patch hole in water jacket of engine

In message <cCUlhtvFIYkV-pn2-xyheI6FE1BQ2@localhost >, Ian Johnston
<NOianSPAM.NOgroupsSPAM@btinternet.com > writes
>On Fri, 25 Jun 2004 08:01:08 UTC, Keith <keith@nospam.demon.co.uk>
>wrote:
>
>: Welding cast iron is not a good solution, in my opinion. Can require
>: pre-heating of cylinder block
>
>What about Lumiweld sticks? Never used them myself, but I think there
>are fairly low temperature ones for cast iron...
>
Possible. Don't have any personal experience with them.
--
Keith replace nospam with ilf0rd


01 Jul 2004 08:56:24
Tony Brooks
Re: how to patch hole in water jacket of engine

Just had another thought and posssibly the easiest. Its related to another
post about hollow wall fixings.

You can get rubber ones where a centre bolt pulls the rubbe up inside the
wall to form a tight grip.

As long as there is enough depth in the water jacket to push the rubber
sleeve in, this would not even need tapping.


Tony Brooks

"Tony Brooks" <marine@reading-college.ac.uk > wrote in message
news:2k22poF15t1jaU1@uni-berlin.de...
>
> "Tony of Judicious" <tony@deletethis.thoward.plus.com> wrote in message
> news:koFCc.21056$NK4.3482384@stones.force9.net...
> > Barret Bonden wrote:
> >
> > > Have a small hole in the water jacket of my inboard gas engine; this
> is
> > > sea water cooled, so of low pressure. How to patch ? I've drilled it
> and
> > > it will now it will take a 3/8 bolt. I've thought of placing a large
> > > washer and the bolt in the hole, using a silicone gasket maker like to
> > > seal it, and
> > > then perhaps to cover it all with a "cold weld" epoxy made for
bonding
> > > metals - any thoughts ?
> >
> > Sounds OK providing there is an adequate wall thickness.
> >
> > Don't use silicone, it is horrible. Would think a soft copper washer
> would
> > be better. Epoxy over the top is overkill, also epoxy degrades at hot
> > water temperatures.
> >
> FWIW If all else fails I think you could use one of, what I know of as,
> Devcon products - a sort of high class "body filler", heavily loaded with
> metal. Not much of a recmendation , but BMC (shows how long ago - so it
> should have got better) suppled it as a factory approved mod for faulty
> castings.
>
> Tony Brooks
>
>