| Re: [GMCnet] Timing chain [message #64313 is a reply to message #64303] |
Sun, 15 November 2009 06:35   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Gary,
Here's some info on Gene's website regarding changing the timing chain. Keep
scrolling down until you get to the bottom of the page.
http://gmcmotorhome.info/engine.html#Rebuild
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Gary Casey
Sent: Sunday, 15 November 2009 10:57 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Timing chain
I'm trying to work up the ambition, so I thought I would ask the question:
I've got a '73 with about 155,000 miles on the original timing chain, as
best I can find out. Were there any plastic sprockets used in these models?
Should I change my chain now? I've got the heads off, so now is as good a
time to do it as any. I just need the ambition....:-). I assume I have to
jack up the engine to remove the front engine mount. Gary
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Brakes and brake fluid [message #64322 is a reply to message #64317] |
Sun, 15 November 2009 07:55 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Robert Mueller wrote on Sun, 15 November 2009 07:03 |
G'day,
Another anecdote; Harley Davidson used Dot 5 for years but changed back to
Dot 3 a couple of years ago. I think the fact that water could gather in
slugs was the reason. Now you've got to be careful not to get it on the tank
and front fender if you add brake fluid.
Regards,
Rob Mueller
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The reason I heard Harley switched from DOT 5 to DOT 4 was the cop bikes were getting ABS and the ABS unit mfr specified DOT 4, no DOT 5. Harley supposedly originally went with DOT 5 because of the paint damage issues with DOT 3/4.
The Vette has had DOT 5 since before 81 and I have overheated the brakes a number of times (high speed autocross on racetracks) and never lost pedal. The Harley brakes have also been overheated (track days at Road America and Blackhawk Farms) with no loss of brake pressure. In both vehicles I knew the brakes were hot as I had severe brake fade from hot pads, and from the smell. On the Harley if I did not flush the brake system annually I would loose pressure when I went over high Rocky Mountain passes, brakes were cold. I had that happen twice before I figured it out. DOT 5 absorbs air and the air came out under low pressure forming bubbles. Not fun but the Harley has a big engine and lots of manual gears so engine braking is very effective. The Vette has never been into the Rockies with DOT 5 in the system. But if I am going to take the Vette there it will get a flush before I go.
On the GMC, based on my experiences with DOT 5, I will be using DOT 4 in two colors.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Brakes and brake fluid [message #64340 is a reply to message #64322] |
Sun, 15 November 2009 11:41 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Another Anecdote:
I have been using all 3 types of brake fluid for more than a few decades. (A friend looked and my shelf and asked if I had some problem making up my mind.)
DOT5 has always been my preferred for things that either get little use or extreme use - nice mix??
On a very few occasions, there have been component failures shortly after a change of fluid only from DOT3 to DOT5. For this reason only, I will not convert the GMC to DOT5 at the upcoming brake service.
I have never ever had any difficulty with a system changed to DOT5 when the entire brake system (like everything but the backing plates and maybe drums) is replaced.
When I change to all stainless lines and braid over flexible while converting to six wheel disk (hopefully with anti-lock), I will change the system to DOT5. That is only waiting for the results of the lottery to go my way.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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