Hi,

I need to press a bushing into its mounting. It's one of these concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia

On 05/09/2017 21:25, Al wrote:
Hi,

I need to press a bushing into its mounting. It's one of these concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia

Do you have a pillar drill? With suitable bits and pieces, this is an
accurate press and can give more force than you might at first think.

Depending on the geometry of the bits, you can sometimes press bushes
into place using a vice.

The other trick is to use bolts or studding with suitable nuts and
washers to pull it into place.

As with a ball bearing unit, ideally you would apply the force to the
outer part. This avoids stressing the rubber, also you can tap it with a
hammer to get some impact force.

If you have a suitable sized socket set, sockets can be used as really
useful drifts. The steel is hard so you can apply a lot of direct force,
or impact with a hammer, without the socket distorting.

A trolley jack would probably be the last thing I would use, and I
certainly wouldn't be pressing against a sump. Against a chassis member,
maybe.

On 05/09/17 21:25, Al wrote:
Hi,

I need to press a bushing into its mounting. It's one of these concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia


Pop the bush in the freeze for a few hours.

If you can, heat the 'hole' (eg with boiling water).

I had the same problem some years back on an old Mk2 Escort, the bushes
on a stabliser bar at the back. I popped the bushes in the freezer and
dipped the holes/receptacles in a pot of boiling water. I then just
tapped them into place, with a tube as a guide.

On 05/09/2017 21:25, Al wrote:
Hi,

I need to press a bushing into its mounting. It's one of these concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia


Bolt and big washers.

In article ,
Al wrote:
I need to press a bushing into its mounting. It's one of these concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

Suitable nut and bolt and washers? Sometimes a square drive socket can be
used instead of a washer - rather stronger.

--
*I'm not as think as you drunk I am.

Dave Plowman London SW
To e-mail, change noise into sound.

On 05/09/17 21:56, newshound wrote:
On 05/09/2017 21:25, Al wrote:
Hi,

I need to press a bushing into its mounting. It's one of these concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia

Do you have a pillar drill? With suitable bits and pieces, this is an
accurate press and can give more force than you might at first think.

Depending on the geometry of the bits, you can sometimes press bushes
into place using a vice.

The other trick is to use bolts or studding with suitable nuts and
washers to pull it into place.

As with a ball bearing unit, ideally you would apply the force to the
outer part. This avoids stressing the rubber, also you can tap it with a
hammer to get some impact force.

If you have a suitable sized socket set, sockets can be used as really
useful drifts. The steel is hard so you can apply a lot of direct force,
or impact with a hammer, without the socket distorting.

A trolley jack would probably be the last thing I would use, and I
certainly wouldn't be pressing against a sump. Against a chassis member,
maybe.

G cramp and sockets make a decent small press.


--
"Corbyn talks about equality, justice, opportunity, health care, peace,
community, compassion, investment, security, housing...."
"What kind of person is not interested in those things?"

"Jeremy Corbyn?"

On 05/09/2017 23:41, The Natural Philosopher wrote:
On 05/09/17 21:56, newshound wrote:
On 05/09/2017 21:25, Al wrote:
Hi,

I need to press a bushing into its mounting. It's one of these
concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia

Do you have a pillar drill? With suitable bits and pieces, this is an
accurate press and can give more force than you might at first think.

Depending on the geometry of the bits, you can sometimes press bushes
into place using a vice.

The other trick is to use bolts or studding with suitable nuts and
washers to pull it into place.

As with a ball bearing unit, ideally you would apply the force to the
outer part. This avoids stressing the rubber, also you can tap it with
a hammer to get some impact force.

If you have a suitable sized socket set, sockets can be used as really
useful drifts. The steel is hard so you can apply a lot of direct
force, or impact with a hammer, without the socket distorting.

A trolley jack would probably be the last thing I would use, and I
certainly wouldn't be pressing against a sump. Against a chassis
member, maybe.

G cramp and sockets make a decent small press.


Agreed. For small stuff I have occasionally used Mole Wrenches too.

In article ,
newshound wrote:
G cramp and sockets make a decent small press.


Agreed. For small stuff I have occasionally used Mole Wrenches too.

A bolt through the middle is likely to keep it square, though.

--
*If God dropped acid, would he see people?

Dave Plowman London SW
To e-mail, change noise into sound.

On 05/09/2017 22:02, Brian Reay wrote:
On 05/09/17 21:25, Al wrote:
Hi,

I need to press a bushing into its mounting. It's one of these concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia


Pop the bush in the freeze for a few hours.

If you can, heat the 'hole' (eg with boiling water).

I had the same problem some years back on an old Mk2 Escort, the bushes
on a stabliser bar at the back. I popped the bushes in the freezer and
dipped the holes/receptacles in a pot of boiling water. I then just
tapped them into place, with a tube as a guide.

I was wondering about cooling and heating.

Most plastics are around 50 x 10^-6 /K, so 40C below room temperature
would give a contraction of 0.2%

Steel is around 12 x 10^-6 / K, so 80C above room temperature would give
you an expansion of 0.1%

Total 0.3%

I'm wondering if that is enough, given the rubber will lose it's ability
to deform at low temperatures? I might consider oil, cooking oil
vapourises at 200C or so.

On 06/09/2017 23:34, Dave Plowman (News) wrote:
In article ,
newshound wrote:
G cramp and sockets make a decent small press.


Agreed. For small stuff I have occasionally used Mole Wrenches too.

A bolt through the middle is likely to keep it square, though.


Oh yes, agreed; just that sometimes there are other constraints. And a
mole concentrates the force like nothing else.

On 07/09/2017 00:45, Fredxxx wrote:
On 05/09/2017 22:02, Brian Reay wrote:
On 05/09/17 21:25, Al wrote:
Hi,

I need to press a bushing into its mounting. It's one of these
concentric
steel & rubber types about 40mm dia and an interference fit with its
mounting and I don't have a fancy press. Once I get it started I can
probably use a trolly jack to squish the two components up against the
sump of my car, BUT I need to get the bushing and its mount correctly
aligned and *just* on the point of entering it first. Any suggestions as
to how to get this started?

tia


Pop the bush in the freeze for a few hours.

If you can, heat the 'hole' (eg with boiling water).

I had the same problem some years back on an old Mk2 Escort, the bushes
on a stabliser bar at the back.Â* I popped the bushes in the freezer and
dipped the holes/receptacles in a pot of boiling water. I then just
tapped them into place, with a tube as a guide.

I was wondering about cooling and heating.

Most plastics are around 50 x 10^-6 /K, so 40C below room temperature
would give a contraction of 0.2%

Steel is around 12 x 10^-6 / K, so 80C above room temperature would give
you an expansion of 0.1%

Total 0.3%

I'm wondering if that is enough, given the rubber will lose it's ability
to deform at low temperatures? I might consider oil, cooking oil
vapourises at 200C or so.

I *assume* the OP's problem was silentbloc type bushes so only the
differential expansion associated with steel. Unlike rolling element
bearings (where the housings and races are accurately machined but have
small clearances), these components are usually pressed steel and so not
particularly accurate. As long as the bores are clean and rust-free, you
should not need too much force and personally I doubt if heating would
make much difference. Obviously, it would if you took the housing up to
red heat with a gas torch, but then you would be in danger of "cooking"
the rubber even if you sprayed it with water as soon as the bush was in
place.