74 Guzzi Eldorado - Page 13

danedg · 04-10-2012, 04:31 PM

So this appears dead. Am I wrong?

ADV8 · 04-10-2012, 05:29 PM

Pull the dust seal off and have a look ?

Brembo 08 piston kits are readily available.

danedg · 04-10-2012, 06:06 PM

It ain't gonna kill me to get a fresh new one,whereas it probably WOULD kill me to try and use this corroded lump again.
Two Craftsman screw drivers didn't budge a thing.
The instructions suggest blowing compressed air into the bleeder hole to gently blow the pistons out to replace the seals...

Polar bears ain't gonna get them seals outta those holes!!!

richarddacat · 04-10-2012, 06:17 PM

I had one like that on a old BMW ATE and filled it with Liquid Wrench, sealed it and left it in a bucket of kerosene for a few days.
It worked, make sure you point it in a trash can when you apply air pressure and not outside towards the car.

F_Sahms · 04-10-2012, 06:19 PM

Quote:

Originally Posted by danedg

It ain't gonna kill me to get a fresh new one,whereas it probably WOULD kill me to try and use this corroded lump again.
Two Craftsman screw drivers didn't budge a thing.
The instructions suggest blowing compressed air into the bleeder hole to gently blow the pistons out to replace the seals...

Polar bears ain't gonna get them seals outta those holes!!!

Heat to smoking with a propane torch. Heat more. Spray piston edge with penetrating oil of choice. Clamp caliper half in a vice with some kind of soft jaws. Twist piston out with vicegrips. I haven't lost one yet.

I have had to ditch calipers for snapped-off bleeder nipples, though.

danedg · 04-10-2012, 06:28 PM

Quote:

Originally Posted by F_Sahms

Heat to smoking with a propane torch. Heat more. Spray piston edge with penetrating oil of choice. Clamp caliper half in a vice with some kind of soft jaws. Twist piston out with vicegrips. I haven't lost one yet.

I have had to ditch calipers for snapped-off bleeder nipples, though.

MAPP gas is all I use for that sort of thing!

The bleeder didn't actually look that bad. It was embedded in a greasy goo, probably not a bad thing. But I didn't try a wrench on it yet....

Nick in PRC. · 04-10-2012, 09:15 PM

Quote:

Originally Posted by danedg

But I didn't try a wrench on it yet....

Lots of heat on the bleeders first.

wmax351 · 04-11-2012, 02:26 AM

Soak in pb blaster, or whatever. ATF and acetone is great.

Then use a grease gun to put grease into the caliper. I just put a grease nipple on the inlet side. However you do it, a hand grease gun can put 3000 psi out without problem, and it is hydrostatic, so you don't blow a piston through the wall.

hunter_greyghost · 04-11-2012, 03:52 AM

Quote:

Originally Posted by wmax351

Soak in pb blaster, or whatever. ATF and acetone is great.

Then use a grease gun to put grease into the caliper. I just put a grease nipple on the inlet side. However you do it, a hand grease gun can put 3000 psi out without problem, and it is hydrostatic, so you don't blow a piston through the wall.

Like the way you think, very practical solution,

Cheers
Baza

danedg · 04-11-2012, 05:13 AM

Thank You Gentlemen,

This is all great stuff! While the particular nuance of each bike/brand keeps us entertained, I especially enjoy the basic methods of work that apply to them all!

I'm getting the feeling here that once the pots have been extracted that the caliper housing can be reused? I was concerned about the corroded receivers losing their ability to contain hydraulic pressure...

sjc56 · 04-11-2012, 05:44 AM

The one advantage of my 74 Eldorado project with the four leading shoe drum brake.No hydraulics to worry about. On my 77 Lemans I replaced all the calipers. At the time it wasn't that much more over a rebuild with new seals and piston.

danedg · 04-11-2012, 08:12 AM

I love the smell of NutsOff in the morning! It smells like...Victory!
They looked a lot worser than they wuzzer.

New aluminum pistons, pads, bleeder on the way...

wmax351 · 04-11-2012, 01:02 PM

Quote:

Originally Posted by hunter_greyghost

Like the way you think, very practical solution,

Cheers
Baza

Worked great on my '73 Triumph TR7V, even after 15 years sitting in santa cruz.

danedg · 04-11-2012, 02:55 PM

Quote:

Originally Posted by wmax351

Soak in pb blaster, or whatever. ATF and acetone is great.

Then use a grease gun to put grease into the caliper. I just put a grease nipple on the inlet side. However you do it, a hand grease gun can put 3000 psi out without problem, and it is hydrostatic, so you don't blow a piston through the wall.

Friggin' brilliant!

sjc56 · 04-12-2012, 06:37 AM

We used the grease method on a frozen piston on a /5 BMW had.

04-10-2012, 04:31 PM	#181
danedg Horizontally Opposed Joined: May 2008 Location: U-puku-ipi-sing Oddometer: 5,294	Crustacean So this appears dead. Am I wrong?

04-10-2012, 05:29 PM	#182
ADV8 Taumarunui..Darwin.. Joined: Nov 2007 Location: North of Sydney. Oddometer: 2,110	Pull the dust seal off and have a look ? Brembo 08 piston kits are readily available. __________________ Les .. 1968 Husqvarna MF250 and MF360 - 1971 Norton Commando Fastback - 1973 Kawasaki H2A - 1973 Ducati 750 GT - 1973 Moto Guzzi Eldorado - 1974 Kawasaki H2B - 1974 Triumph TR5T Trophy Trail - 1981 Ducati 900 SD - 1986 Husqvarna 400 WR - 1998 Suzuki TL1000S - 1998 Suzuki TL1000S - 2007 Ducati Hypermotard 1100S - 2008 Suzuki DR780.

04-10-2012, 06:17 PM	#184
richarddacat breaking wind Joined: Nov 2006 Location: VolunteerState Oddometer: 2,582	I had one like that on a old BMW ATE and filled it with Liquid Wrench, sealed it and left it in a bucket of kerosene for a few days. It worked, make sure you point it in a trash can when you apply air pressure and not outside towards the car. __________________ * 05FJR/74R90s * If we concentrated on the really important stuff in life, there'd be a shortage of motorcycles. project litter box

04-11-2012, 05:44 AM	#191
sjc56 Studly Adventurer Joined: Oct 2006 Location: Broad Brook CT USA Oddometer: 820	The one advantage of my 74 Eldorado project with the four leading shoe drum brake.No hydraulics to worry about. On my 77 Lemans I replaced all the calipers. At the time it wasn't that much more over a rebuild with new seals and piston. __________________ Steve

04-11-2012, 08:12 AM	#192
danedg Horizontally Opposed Joined: May 2008 Location: U-puku-ipi-sing Oddometer: 5,294	Mission Accomplished I love the smell of NutsOff in the morning! It smells like...Victory! They looked a lot worser than they wuzzer. New aluminum pistons, pads, bleeder on the way...

04-10-2012, 06:06 PM	#183
danedg Horizontally Opposed Joined: May 2008 Location: U-puku-ipi-sing Oddometer: 5,294	It ain't gonna kill me to get a fresh new one,whereas it probably WOULD kill me to try and use this corroded lump again. Two Craftsman screw drivers didn't budge a thing. The instructions suggest blowing compressed air into the bleeder hole to gently blow the pistons out to replace the seals... Polar bears ain't gonna get them seals outta those holes!!!

04-11-2012, 02:26 AM	#188
wmax351 Studly Adventurer Joined: Mar 2011 Location: Marin County and Berkeley, CA Oddometer: 740	Soak in pb blaster, or whatever. ATF and acetone is great. Then use a grease gun to put grease into the caliper. I just put a grease nipple on the inlet side. However you do it, a hand grease gun can put 3000 psi out without problem, and it is hydrostatic, so you don't blow a piston through the wall.

04-11-2012, 05:13 AM	#190
danedg Horizontally Opposed Joined: May 2008 Location: U-puku-ipi-sing Oddometer: 5,294	Thank You Gentlemen, This is all great stuff! While the particular nuance of each bike/brand keeps us entertained, I especially enjoy the basic methods of work that apply to them all! I'm getting the feeling here that once the pots have been extracted that the caliper housing can be reused? I was concerned about the corroded receivers losing their ability to contain hydraulic pressure...

04-12-2012, 06:37 AM	#195
sjc56 Studly Adventurer Joined: Oct 2006 Location: Broad Brook CT USA Oddometer: 820	We used the grease method on a frozen piston on a /5 BMW had. __________________ Steve

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