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Author Topic: Rebuild 8V-71  (Read 401 times)
treeplanter
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the grey ghost,1971 GMC 5305A




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« on: April 21, 2018, 06:52:52 PM »

I need to have my engine looked at and more than likely rebuilt, we live in North Idaho and asking you fellow bus folks for recommendations as where we could find a reputable shop not to far away to work on our 71 fishbowl 8V-71. Thank you for your help.
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Timothy
Bill Gerrie
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« Reply #1 on: April 21, 2018, 08:10:21 PM »

They are not that hard to rebuild. Have you considered rebuilding it yourself? I am too far away to help but I have done several over the years.
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treeplanter
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the grey ghost,1971 GMC 5305A




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« Reply #2 on: April 21, 2018, 10:20:25 PM »

I have not considered that, right now I have so many projects to do im looking for a shop to do it.
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Timothy
luvrbus
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« Reply #3 on: April 22, 2018, 06:16:46 AM »

Hillsboro Diesel in Hillsboro OR would be my choice maybe 300 or 400 miles from you
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Life is short drink the good wine first
TomC
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« Reply #4 on: April 22, 2018, 07:42:32 AM »

Like my AMGeneral, you're fishbowl's engine & transmission is on a cradle. Takes about 2 hours to get the entire assembly out-once out is much easier to overhaul the engine. Cliff's suggestion is a good one. Maybe consider turboing the engine now. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
treeplanter
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the grey ghost,1971 GMC 5305A




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« Reply #5 on: April 22, 2018, 07:48:07 AM »

Would a turbo help with hills?
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Timothy
treeplanter
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the grey ghost,1971 GMC 5305A




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« Reply #6 on: April 22, 2018, 08:12:45 AM »

Thank you Cliff Iíll call them. About an eight hour trip away.
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Timothy
richard5933
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« Reply #7 on: April 22, 2018, 08:58:19 AM »

I've had a pretty good relationship with the Interstate location here in Wisconsin, and I believe that they have a location in Billings, Montana. Doesn't seem too far away from Idaho. I believe that Interstate is a DD dealer, and from what I've seen here in Wisconsin they have techs familiar with buses and two strokes.

There is a great video log of the Technomadia folks getting the 8V71 in their 4106 rebuilt while they camped in the Interstate parking lot for a while. Might be worth a call.

http://www.technomadia.com/2013/08/rebuilding-an-8v-71-detroit-diesel-engine/
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Richard
1974 GMC P8M4108a-125 (Current Bus)
1964 GM PD4106-2412
Located in beautiful Wisconsin
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chessie4905
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« Reply #8 on: April 22, 2018, 09:48:24 AM »

I assume you are prepared for the cost to do a rebuild on your engine?
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GMC h8h 649#028 (4905)
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treeplanter
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the grey ghost,1971 GMC 5305A




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« Reply #9 on: April 22, 2018, 10:36:00 AM »

Thinking around 20,000?
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Timothy
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« Reply #10 on: April 22, 2018, 10:43:13 AM »

Hillsboro will be under 20 and Interstate will be well over 20 grand,you can probably save more if you are not in hurry by letting Hillsboro do it on a fill in when they are not over run with work    
« Last Edit: April 22, 2018, 10:46:59 AM by luvrbus » Logged

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treeplanter
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the grey ghost,1971 GMC 5305A




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« Reply #11 on: April 22, 2018, 02:36:38 PM »

Ok, sounds like Hillsboro is the choice, thanks for the tip.
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Timothy
TomC
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« Reply #12 on: April 22, 2018, 06:47:26 PM »

N65 injectors will get you 308hp and 800lb/ft torque with horsepower reduction as you go up in altitude. My engine with 7G75 injectors, air to air intercooling, bypass blower gets 375hp and 1125lb/ft torque. Nearly 30% more pulling power. If you rebuild your engine to turbo specs with lower compression 2 piece pistons, with 7G80 injectors you can get 400hp and 1200lb/ft torque. And believe me, the performance is truly different, but fuel mileage is about the same. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
eagle19952
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« Reply #13 on: April 22, 2018, 07:00:07 PM »

N65 injectors will get you 308hp and 800lb/ft torque with horsepower reduction as you go up in altitude. My engine with 7G75 injectors, air to air intercooling, bypass blower gets 375hp and 1125lb/ft torque. Nearly 30% more pulling power. If you rebuild your engine to turbo specs with lower compression 2 piece pistons, with 7G80 injectors you can get 400hp and 1200lb/ft torque. And believe me, the performance is truly different, but fuel mileage is about the same. Good Luck, TomC

but the $$'s double.
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Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.
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« Reply #14 on: Today at 04:09:21 AM »

and heat issues.
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GMC h8h 649#028 (4905)
Pennsylvania-central
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