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CATEGORY LISTINGS > DETROIT > 3-71 low block [ REFRESH ]
Thread Title:

3-71 low block


Created On Tuesday October 28, 2014 05:49 Diesel Talk
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westcoast
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Note Tuesday October 28, 2014 05:49 View users profile View thread in raw text format
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Hey joe , a couple of questions mate, 1952 low block. Original honeycomb liners and hv 60 injectors , 2v head - I,m thinking N series liner kits , 4V head and n60 injectors . Original head was cracked as you probably knew. Engine is for a drill rig so wont be A timed but set at 1500 rpm Any suggestions Regards David

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detroit
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westcoast
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Note Tuesday October 28, 2014 06:59 View users profile View thread in raw text format
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Has the original brass full flow fiiter and the detroit by-pass but I,m putting on the later full flow spin on oil cooler housing and deleting the cold start coil etc etc Regards David

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detroit
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JoeZ
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Note Wednesday October 29, 2014 03:34 View thread in raw text format
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I don't even know if the old style liners are available anymore so you don't have much choice. The 4 valve head is no problem. As far as injectors, the HV and S injectors were obsolete last time I needed any, but there was a replacement which wasn't N series. I think the only difference was the advance was faster on the N series. Still should work though. I did something similar several years ago on a sawmill engine that had HV6 Yellow tag injectors and the only issue was the engine was less stable at high RPM meaning when it came off load, it didn't over-rev, but it didn't would gain a few hundred RPM before settling down and the owned insisted it was going to blow, so I replaced the injectors but I don't remember what I put in. In your case, steady load should work. The sawmill was running 1800 RPM single weight...and you probably have the same.

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Wednesday October 29, 2014 08:06 View users profile View thread in raw text format
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Thanks Joe, single weight- governor - I was thinking 4V and N series kits to give the old girl better start and cut the smoke down , one thing I looked at was the difference in liner ports - have you ever opened up the old blocks or did,nt you think it would make a difference ? Regards David

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detroit
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JoeZ
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Note Wednesday October 29, 2014 16:36 View thread in raw text format
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I modified the ports once on a 353 that was installed in a pick up to get air in quicker like the race guys do and it worked for a while then the engine got to be a dog so when I looked inside, the engine was all sludged and carboned up. I guess it was burning into the air chamber so much that it plugged it up to where not much air was getting in. Maybe Detroit knew what they were doing after all...

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Thursday October 30, 2014 06:37 View users profile View thread in raw text format
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I know an old detroit bloke that did the mods when they went from the old lube system to the bypass filter etc etc and when they used n series liner kits they were concered about air flow through the liner ports . They opened up the block casting but did,nt find much improvement as n series pistons and n60 squirters improved the engine so developement stopped there Regards David

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detroit
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JoeZ
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Note Friday October 31, 2014 04:13 View thread in raw text format
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I don't know how it is there, but here it is hard to even find a decent parts source or a parts person who knows what they are looking for. My parts books have numbers that have changed so many times in the last few years, so when the Detroit dealer has to, he calls in a retired mechanic that is familiar with these two stroke engines. A couple of months ago I couldn't get thermostat housing gaskets for an 8V71. The old mechanic went into the shop and handed me a big dusty stack of about 20 old 71 series gasket sets and seals and said take these with you.

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Friday October 31, 2014 06:25 View users profile View thread in raw text format
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Question -why do you keep all this shit for !!!For when you young pricks come in on sunday and nobody else has it , I can relate too that Joe - my books for 71 go back to 1960 but detroits go back to 2004 Service manager said " mate I don,t have a technician here thats seen a two stroke rocker cover let alone taken one off " Regards David

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detroit
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westcoast
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Note Friday October 31, 2014 06:30 View users profile View thread in raw text format
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That,s funny that you can,t buy two stroke parts there but I can buy them from the states no problems Regards David

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detroit
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JoeZ
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Note Friday October 31, 2014 11:43 View thread in raw text format
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A few years ago a MTU sales person stopped in boasting on how they were in the process of manufacturing some new 8V92 non electronic engines. I'm still waiting. Reliabilt, yes, but not new. Priced one out for a motorcoach and it was over $20,000 back in the summer. That one was towed away with the engine apart.

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Saturday November 01, 2014 06:53 View users profile View thread in raw text format
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Well l respect the old fellas , and when they,re gone the imformation dies with them, l ,m fifty one and have a bit of knowledge to pass on but where do you find a sixteen year old that will do the hard yards in to learn. Joe - problem is we,re vehicle mechanics not technicans nice name but we know more - as l said a couple of years ago Joe don,t retire we need hard copies not e-books Regards David

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detroit
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JoeZ
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Note Saturday November 01, 2014 17:20 View thread in raw text format
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I call it the smell of death...either fried oil smell or a swamp smell. You know what I mean. I had a young guy with a DT-466 log truck and too many problems. Head gasket and injector pump. I opened it up and told him it smelled like a swamp and to me the engine was history. He told me he never heard of a mechanic that could smell a dead engine. Offended, he towed to another shop that put $3500 into getting it running. He never made it home before it siezed up. His dad who was a long time customer came to me and akked me how I knew. You just can't explain some things...you just have to know from experience.

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Sunday November 02, 2014 05:14 View users profile View thread in raw text format
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That sweet sickly oil smell, young blokes have to earn it not learn it . Somebvody has to teach the younger ones correctly as the dealerships don,t Regards David

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detroit
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westcoast
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Note Saturday December 27, 2014 08:48 View users profile View thread in raw text format
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Hey Joe , 1952 to 2014 spec . DId,nt have faster geartrain so used lighter govenor weights with lighter govenor high speed spring, spin on adaptor for oil filter - series 60 fuel filter head .Started up beautiful . No smoke and responsive and govenor returned nicely Regards David


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detroit
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JoeZ
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Note Thursday January 01, 2015 14:06 View thread in raw text format
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Just glad to hear it all worked out well....good going.

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Monday January 05, 2015 07:43 View users profile View thread in raw text format
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Hey Joe , on the early engines did they have any coolant control ? 3-71 just rebuilt running cold . 173 degree thermostat but only running at 160 -too cold .Running at 1000 rpm ,can,t use more power as engine now is too powerful for drill rig . blocked radiator with plate and changed nine blade to five blade fan Regards David

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detroit
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JoeZ
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Note Tuesday January 13, 2015 04:51 View thread in raw text format
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It should just be thermostst controlled other than the bypass if it has one. I can't imagine enough coolant passing through the bypass to keep it running that cold. Maybe defective thermostst??

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One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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westcoast
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Note Tuesday January 13, 2015 07:38 View users profile View thread in raw text format
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Removed six blade fan with 45 degree pitch and replaced with four blade at 15 degree pitch , it,s better but will change to a thermo fan 16 inch set at 185 degree Regards David

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detroit
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