| Author |
Message |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 02, 2003 - 9:53 pm: | |
Hey all you Crown guys, can any of you take a photo of your motor and show me where the oil supply line to the turbo hooks into the engine block? I am about to bolt on my turbo and have no clue where to tap the engine for it's oil...
Cheers
Gary |
Henry R. Bergman, Jr. (Henryofcj) (63.224.197.10)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 04, 2003 - 3:38 pm: | |
Good question. My 250 Big Cam has no turbo either, soosssss I am also wondering where in heck the oil comes from.
Do know there is a drain pipe from the turbo which goes back into the forward rocker cover. Gravity oil return.
Do not know where the oil comes from. Maybe someone who has a turbo 743 or 855 will let us both know. Good luck Gary and CROWNS FOREVER!! |
Geoff (Geoff) (66.238.120.176)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 04, 2003 - 3:46 pm: | |
The main galley oil passage runs along the center outside of the engine, you should be able to find several pipe plugs on this horizontal line, one of them is probably being used for an oil sending unit so this should line you up. (on either side of the block).
--Geoff
'82 RTS CA |
Henry R. Bergman, Jr. (Henryofcj) (63.224.197.10)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 04, 2003 - 7:17 pm: | |
Gary;
Geoff has it right. I talked to Fred our local retired Cummins master mechanic or something close and he sayssss...
...You can pick up the oil pressure from several points on the block of your mighty 743 pancake Cummins...
...which is called that because...well...it is as flat as a pancake, thus its name. Your choice of the oil pressure sender unit or....
....the water cooled oil cooler on the front of the block, or any of the oil pressure plugs on either side of the block.
He also sayssss that your turbo may have a restrictor fitting on it as the amount of oil the turbo actually needed was not that much.
Also sayssss that it was usually the #6 piston next to the clutch housing that weeped or seeped the head gasket first....
....but that only usually happened with much higher pressure (up to 30 psi) than you plan on running. He saysss go for it and have fun...
Also tried your E-mail addresses with no luck since it seems your have changed them. No problemo. CROWNS FOREVER!!! Henry of CJ |
RJ Long (Rjlong) (24.127.74.29)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 04, 2003 - 8:03 pm: | |
Let me throw in my two cents worth here:
Back in the days when I played around a lot with Corvair turbos, there were several points that were stressed to promote turbo longevity:
~ Clean oil. On the Corvair, the turbo oil feed line (1/8" chromed gas line, btw) came off a tee fitting that screwed into the returning oil passage directly from the filter back into the engine. This tee was shared with the oil pressure idiot-lite sender. Try to find a similar location to tap your feed line.
~ Turbo oil drain line: Due to the high rotational speeds of the turbo, there is a considerable amount of oil foaming that takes place. The recommended return line was a minimum of 2.5 times the diameter of the feed line, and preferably a gravity flow set-up to minimize backpressure and to give the foam bubbles ample opportunity to dissipate before returning to the oil pan. (On the Corvair, Chevy used a 1/2" diameter drain line.)
~ Clean air: The compressor blades do not take kindley to junk getting past the air cleaner. Break a blade, and the turbo will self-distruct from vibration. And if it's compressor blades - that means into the engine itself. Not a good thing. . .
~ Shut down: After a hard pull, give the turbo a couple of minutes to spool down to idle speed before shutting off the engine. This will bring out some flack from some folk, but the point is this: If you shut a turbo engine down IMMEDIATELY after a hard pull, the turbo's still spinning over 80,000 rpm when you cut off it's oil supply. OTOH, if you give it a minute or two at regular engine idle, it will spool down enough so when the engine is shut off, it will be spinning slow enough to stop w/o damage. Here's two examples to illustrate my point:
Example 1: pulling a 6% grade on a 90 degree day, you blow a tire, so you pull over and stop, shutting off the engine as soon as the wheels stop turning. BAD.
Example 2: Pulling a 6% grade on a 90 degree day, you decide to make a stop at the Wal-Mart complex at the top of the grade. You pull off on the off-ramp, pull into the parking lot, and work your way to the RV parking area, where you then shut down the engine when you park. GOOD - just the short hop into the parking lot is sufficient to allow spool-down.
~ Good quality oil, changed regularly: Goes without saying, especially for those of us who frequent these boards.
Most of this info comes from Corvair shop manuals and Hugh McInnes' book "How to Select and Install Turbochargers", which is a GREAT book, even if it's a little dated, altho the concepts remain the same. McInnes was the chief design engineer at TRW when GM approached them about supplying turbos for the Corvair and Olds engines. A little techie to read, but not insurmountable.
HTH,
RJ
PD4106-2784
Fresno CA |
Gary Stadler (Boogiethecat) (68.7.217.217)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 05, 2003 - 12:52 am: | |
Thanks guys! Seems less daunting now.
Now for a real killer... I just couldn't talk myself into buying this, because I already have a good one... but it will break your 'lil Crown hearts.... check ebay item # 2517365625 and weep... Sorry but I only found out about it an hour before it ended or I'd have alerted you crownies....
Cheers
Gary |
dougthebonifiedbusnut (136.217.0.194)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 05, 2003 - 8:20 am: | |
Hey Gary,
got my oil from the place geoff suggested you will see 6 1/8 npt plugs on the right side of the block i think the installation guide will tell you to make sure the supply port has got to be above 3:00 and 9:00 oclock soon as i get back from sunny bosnia i will be hard at work on my lady lol (the bywaylady that is)
dougthebonifiedbusnut |
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