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Putting in a replacement L-28


Av8ferg

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Parts finally arrived from MSA,  so I now I have all the pasts I need to get this engine started.  Two questions. 
 

1.  The Z and Zx have different routing for the heater hoses.  The ZX has a pressure regulator on the hear hose near cylinder 5 and the Z doesn’t.   Anyone know about this?  I think have the ZX part in my box of parts they I pulled off the engine when I bought it from the salvage yard.  Is it a better way to go or just plumb it like.a Z. 

look at the images below.  

 

DA15D892-D33A-4D0D-958D-3DAC34B021EB.png

9A288630-DDF7-4D5C-B671-A9FA03803BC7.png

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Very good question and just in time for me because i'm almst ready to put my 280zx N42/N42 engine back in my engineroom.

My car has a N42 head  (280zx) and is cooled as in the lower part of your picture.. i ask myself the same question..  Is that valve needed..  I know that in my first 280zx 1980 eu modell it leaked just a little bit.. (very few drops sometimes on the starter..) it was made of plastic i remember..

If i could leave it out, i would!  (Less parts less problems can occure) 

 

The only thing i can think of is when you don't use the heater there is a bit less water movement in the rear end of the head... as i see a N42 on the 280z (the same one as i got in my 280zx orig EU modell) i think it's not a problem to plumb it like a Z..

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I don’t think this was plastic. Here a pick of a new OEM on for sale on Zcardepot. Also is a pic of the one that came off the engine I bought. Looks like the guy plugged up on port with a sensor. Not sure why unless he was just using it as a plug .

aa772cbd92e0701655ddfb95ffe69cd8.jpg
7a97a41471e9aec2c132093e4d4a35fa.jpg


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I have been running the F54 on my '80ZX without that valve for several years and have found no negative side effects.  I have no way of knowing if my heater core is original, but being as it's no longer available, I'd guess it's at least a decade old.  I inspected it last year when the dash was out while fixing floorboard rust holes and such. No apparent problems.  I run the heat pretty much constantly in the winter. 

I'm not sure if that would ave anything to do with coolant circulation to the rear of the head, but during the break in procedure of my engine, I checked temperatures from the front of the engine to the rear and did not notice any wild variations in temperature(with IR temp reader and spark plug observation). Roughly 3,000 miles since rebuild.

 

He.jpg

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19 hours ago, Av8ferg said:

I don’t think this was plastic.

 

Yes... you are right.. but i now remember it correctly .. i hope.. 

It was like in the picture but the bottom (in pic on the 4 o'clock side)  it was sort of white plastic and sits inside the copper part..  And that was the place it was leaking a little. once in a while a drop..

If you had a pic from the underside it would show the plastic bit.. mind you it was 30 years ago i had that 1980 car.. (these last weeks i did'nt work on my '79. but i could look one time if the valve underside is plastic at the 280zx i have now..)

 

aa772cbd92e0701655ddfb95ffe69cd8.jpg

Looked on internet and...yep, here you can see the plastic part i was remembering... it was leaky right there!

De bronafbeelding bekijken

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Okay, final step before filling the cooling system today was to flush the heater core. Ran a garden hose in the inlet and a hose out the outlet to a bucket. Ran for fresh water for 5 mins, then filled the core with Distilled Vinegar and let set 30 mins, flushed again and ran vinegar again sitting 30 mins and ran fresh water and then blew out all remaining liquid. The water ran brown the first 15 secs on first flush. I got a fair bit of debris out of the core and that stuff that won’t be in my engine. Of note, when flushing the vinegar out after sitting 30 mins, the water came out green for the first 15-20 secs, I’m assuming glthat was build up on the copper coils. Here’s the particles in the bottom of the bucket. Now I have to flush the tankless water heater for the house, it’s time and I have all the gear out already.

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9b3c9f3554815d8631e9a24bf5252d83.jpg


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I looked over the pic as best I could and didn't find anything worth mentioning. Looks great!
So you're thinking tomorrow might be the first start try??
What did you decide to do with the EFI temperature sensor? You running the one out the side of the head?

Thanks CO. I did run that wire to the temp sensor in the head. No routing issues, clean install. I’ll take a closer pic to show you.
I’m going to follow your starting sequence advice verbatim. I don’t think I will start right away. Going to get some fresh gas this AM. Don’t know how off timing will be or even if the distributor I rebuilt will function properly.


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Well, hadn’t thought about that. The good news is the engine never ran for more that 2-3 mins continuously. Temp didn’t get too hot.

She’s finally under her own power....great feeling of accomplishment but still lots to work out...like an exhaust, and bleeding the front brakes, an alignment and torque down the remaining parts of the front suspension. She drove up here on here own power! Baby steps...

At least I can get a good view from below now to make all that happen.

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000e3f759acda41ec512a15dbabf9ee1.jpg


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Yea my neighbor came over and said what was all the noise over here. I pulled in the street and I left it running for about a min but was worried I’d get some complaints. But there is good news.....Santa came early this year.

Found this at my front door after sitting through 5 hrs grueling hours of my daughters Nutcracker Dress Rehearsal last night. 5 hours and her parts are 15 mins max.

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These pipes are big!!! Maybe overkill.


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On 11/19/2021 at 5:14 AM, Av8ferg said:

Yea my neighbor came over and said what was all the noise over here. I pulled in the street and I left it running for about a min but was worried I’d get some complaints. But there is good news.....Santa came early this year.

Found this at my front door after sitting through 5 hrs grueling hours of my daughters Nutcracker Dress Rehearsal last night. 5 hours and her parts are 15 mins max. emoji848.png

cbc0046028a76e84972f70c0c26523aa.jpg

7cb6995bd2f47c2d6690ddb89ca28301.jpg
These pipes are big!!! Maybe overkill.


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Two questions.

 

Is that lift in your garage?

 

And, where did you get the exhaust?

 

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Two questions.
 
Is that lift in your garage?
 
And, where did you get the exhaust?
 

Yes, that lift is in my garage. It was the only way I was going to be able to keep the Z.

The exhaust is from ZStory. Super nice quality, stainless steel with beautiful welds and turns. Sean at ZStory is great. This was less than getting a standard crap exhaust installed locally.
I have a few challenges to overcome. I plan to install this back to front tomorrow. He’s the issue. My header collectors terminate into two 2” pipes. My headers came with a 2” Y pipe that would go to a 2” exhaust line. These Zstory pipes are 2.5” and have a V-band connector at the resonator. So I need to Y pipe with 2” inlets to a 2.5” v-band outlet. See all the below pics. If anyone has a solution let me know. I think I just to buy a Y pipe with 2” inlets and 2.5” outlet and have someone weld the extra v-band fitting Sean gave me to 2.5” outlet on the Y pipe.

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That is a nice system you have John. I don't think there is any true bolt in system. They all need tweeking somewhere.
I have an abart system and it will need some mods to connect to the down pipe.
IMG_20170326_165019166.thumb.jpg.6dd7264ed590ab3206b339a1707a1c0c.jpg
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Chas, very nice and I almost went that route. After talking to Sean at Zstory he really seemed to be someone you can trust and if you have issues he’s going to help resolve it. I’ll hang everything tomorrow and then take exact measurements from the dual down pipe to his V-band connector. He threw in two extra V-band connectors and clamps for me. I’ll buy a dual 2” to 2.5” merge pipe and have it bent right and weld the v-band to the 2.5” side and hopefully it will work. I didn’t want to spend the money initially for his header before I saw if I could make my header work and I think I can. I like challenges....I make me better at solving problems. This car is one challenge after another, I should be a genius by now .


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