Author Topic: 1975 Jimmy 454 Magnum Project  (Read 61638 times)

Offline Mike Phillips

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Re: 1975 Jimmy 454 Magnum Project
« Reply #45 on: July 10, 2009, 01:09:55 pm »
Going fishing...




Again, thanks for all the help guys!


Mike and Rand

Offline Captkaos

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Re: 1975 Jimmy 454 Magnum Project
« Reply #46 on: July 10, 2009, 01:29:22 pm »
Sweet, they almost match.
Are you running different size tires on it?  Don't lock it in...

Offline Mike Phillips

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Re: 1975 Jimmy 454 Magnum Project
« Reply #47 on: July 25, 2009, 03:34:20 pm »
***Update***

After getting everything road worthy and driving to both Big Bear Lake and Lake Havasu with about 700 miles on the new engine I had to remove everything and fix a few things.

Transmission
The 700R4 overdrive transmission wasn't locking up so I took the tranny to Bowtie which is in Hesperia a few miles from my house and after testing the transmission they found a valve was stuck in the transmission and the torque converter was bad.  So $300.00 later she's ready to go back into the truck.


Oil Pan
While removing the tranny and transfercase I noticed that the motor had settled downward into the engine compartment and now the oil pan was resting on the crossmember.  Since I already had the tranny and transfercase out I figured I might as well pull the motor and find a solution for the oil pan.  Since this is a Magnum Marine engine it came with an 8 quart oil pan, I mistakenly assumed if I purchased a stock oil pan it would have less depth overall and fix the problem.  I was wrong.  The front portion of the stock oil pan is the same depth as the 8 quart oil pan so now I have a GM Performance 5 quart oil pan "Paperweight".  I did get a good oil dipstick out of the transaction though. 

Since changing the oil pan isn't an option and there's not enough room to cut the oil pan and notch it, instead I've made 4 spacers using 1/4" plate aluminum.  If I place two of these spacer plates on each motor mount that will give me a 1/2" of engine lift which should be more than enough to enable the oil pan to clear the crossmember.  I also discovered that I was using small block motor mounts instead of big block motor mounts so I'm purchased two new BBC motor mounts.  The size is about the same but the big block motor mounts look beefier and shouldn't squish down as much as the small block motor mounts did.


Metal Particles
After taking the oil pan out I discovered more metal particles in the oil pan than expected from breaking in the new engine.  I had the head machinist, Rick, at our local NAPA store look at it and he said it looked like more metal particles than normal.  He suggested I pull a rod cap and a main cap and inspect the bearing surfaces.  I removed one of each and showed them to Rick and his experienced and trained eye said it looked like dirt had impacted onto the bearing and there was some marring of the bearing surface.

He suggested I install new bearings and clean everything really well.  With the help of my friend and very talented mechanic Cary, we replaced all the main and rod bearings yesterday, then re-installed the oil pan.  This also included taking off the timing chain cover so we put all new gaskets in too.

As I type this it's Saturday, July 25th, a little after 1:00pm 

On June 19th I resigned from the best job I've ever had and that was running the www.MeguiarsOnline.com discussion forum and as the instructor for their detailing classes.  My new job is going to be running the Autogeek.net forum and teaching detailing classes on the east coast for Autogeek.  That's one of the reasons I started this project and that was because I want to take my Jimmy to Florida.  Anyway, I was supposed to leave for Florida with my Jimmy and my boat last Monday so I'm a week behind.

Icing on the cake
Yesterday while using a Peanut Grinder to grind some metal in the engine compartment some abrasive particles off the grinding wheel or some metal particles flew into my right eye.  Yes, I was wearing safety glasses with side shields.  In the future I'll wear either goggles or a face shield.  I thought I rinsed out all the particles but last night the pain became so great I went to the emergency room and the D. had to remove some metal particles embedded into my eye.  It' hurts to blink, I'm wearing an eye patch and the pain killers they gave me are making me dizzy.  My motor, tranny and transfercase are all out of the truck and I'm a week behind.


That's the update.  LOL

Hopefully nothing too horribly bad will go wrong tomorrow as I'm going to try to install everything back into the truck starting at about 6:00am


:)








Offline eventhorizon66

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Re: 1975 Jimmy 454 Magnum Project
« Reply #48 on: July 25, 2009, 04:56:45 pm »
:o Wow, be careful and protect your eyes!!!  It would be a shame not to be able to drive or even see your newly finished blazer.
'85 C10 SWB 350 700R4 TKO600

Offline Mike Phillips

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Re: 1975 Jimmy 454 Magnum Project
« Reply #49 on: July 26, 2009, 12:55:16 pm »
:o Wow, be careful and protect your eyes!!!  It would be a shame not to be able to drive or even see your newly finished blazer.

Picked up some goggles and a face shield today at Lowe's.  Don't plan on doing any grinding but just in case.  I can see today but yesterday I was pretty much blind in my right eye and the pain killers the Dr. gave me made me too dizzy to do anything so I quit taking them.

The big block motor mounts have different spaced holes on one end but because it's very apparant they are much more heavy duty than the small block motor mounts I drilled out a new lower hole in each of the BBC motor mounts, drilled the holes in the aluminum plates for spacers and am getting ready to drop the motor in again.

Have the tranny back with a new torque converter so I should be able to put it all back together and have it drivable by tonight.  (He says with his fingers crossed)

It's supposed to be over a 100 degrees here today so that always makes for a good time in the driveway.  LOL

Will take a video of the engine firing up for the first time, the second time.  (If that makes sense).


Mike   ;D


Offline eventhorizon66

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Re: 1975 Jimmy 454 Magnum Project
« Reply #50 on: July 26, 2009, 01:12:30 pm »
It would be a shame not to be able to drive or even see your newly finished blazer.

Correction: your newly finished Jimmy. :-[
'85 C10 SWB 350 700R4 TKO600

Offline comp

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Re: 1975 Jimmy 454 Magnum Project
« Reply #51 on: July 29, 2009, 02:40:01 am »
waiting to see video  ;D

Offline joesgarage71

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Re: 1975 Jimmy 454 Magnum Project
« Reply #52 on: August 07, 2009, 09:09:25 pm »
Like event said, knock sensor

 Thats good!
 Real nice job Mike
« Last Edit: August 07, 2009, 09:28:39 pm by joesgarage71 »
78' K-20 355/SM465/twin stick 205 6" on 36's
14 bolt FF/big bearing Dana 44 4.56 gears

92' GMC C-1500 454/4L80E/14 bolt

Offline Jim Rockford

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Re: 1975 Jimmy 454 Magnum Project
« Reply #53 on: October 13, 2009, 06:26:11 pm »
Do yourself a favor and ditch that fram filter. A good filter might have cought that crap that ruined your bearings.
1973 k20 Camper special
1980 k20 custom deluxe
2004 Crown Vic LX sport