MH77280Z

I am checking and get back...hang on...

Hi Guys, so i have been working with my mechanic on my 77 280z, it is automatic. The N47 head was cracked so we found a new rebuilt head and engine giving good compression as well. The CAM was old and had plenty of wear so decided to put a new CAM. New spark plugs off course. Gap set to factory. The problem coming in setting the timing. My mechanic is very skilled but obviously he has not worked on 280z before. He says everything fires up nicely but we are not able to set the timing. He says the distributor had to be fully advanced to set the timing. But it should not be this way. It has to align with first cylinder/stroke etc. But when you do that timing is a bit off. There is a new timing kit as well. I told him to open the valve cover and lets make sure original CAM and new CAM is same. Appreciate some guidance here. We are new to 280z and I am almost there to getting the engine fully operational. Need help with setting the timing ... what do you guys think?

So we found cylinder 4 misfire and also coolant in the oil. Seems like there is some issue with the new N47 head holes aligning with the block we have put in. Replacing the head first to fix the leak and try again shortly...my old head was N47 too so not sure why this one is different. It did say N47. update in a few days...

Hi guys, can a bad ECU cause misfire? May be a very general question but want to gauge opinion/experience. Also if I get a new ECU do I need any kind of programming? Even if it is out of a running another 77 280z?

Hi Guys, I have the shop manual but it doesnt show everything, at least at one page. Has anyone put together a vacuum diagram etc.? Mine is 77 280z with AC and EGR. Appreciate any guidance.

The previous head had a crack. Seems like overheating. Engine block and rest of the stuff seems OK. Crack was very micro that couldnt hold pressure test. The mechanic told me it is an N47 head. So we are just going with N47. The engine and stuff have never been taken out all stock so I am sure it has the right manifold. I just got confused by the N42 on the engine block. Thanks for the explanation.

I did some more research seems like N47 is the right head. N42 seems like the engine block number. Also how do you verify if this is matching engine with the chassis or trans?

Hi guys, We are rebuilding a 280z engine and the head seems to be replaced. The engine block says 6831M and N42. My mechanic says it needs a N47 head. Does it need N42 which matches with engine block or N47? Thanks.

Thanks Sir.

Thanks all. I think Dexron III for this time make sense. I have used Dexron III-H successfully in a different car so will go with this. https://www.mobil.com/en/lubricants/for-personal-vehicles/our-products/products/mobil-atf-dm/

Any specific Dexron?

Hi Friends, What ATF fluid to use in the 77 280z. I have the manual but it deesnt say much. Appreciate some guidance.

Hi Guys, hope everyone is staying safe. I have a 280z without a brake booster. Checked on Orielly's and they told me there are 8.5in and 10in version of the booster. Which one does the 77 use? Mine is an automatic transmission if this all matters.

Valvoline MaxLife Synthetic Transmission Fluid - seems to be a reasonable choice. Both Orielly's and AutoZone have this as recommended. Plus it seems to cover range of applications. Unless someone has a differnet opinion. Recommended for use where DEXRON, DEXRON II, III and VI, Toyota T-IV and WS, MERCON(R), MERCON(R) SP and LV, Allison TES 389, Nissan Matic-D, Matic-J and Matic-K, Honda Z-1 (except CVT), Mercedes NAG-1, Mitsubishi Diamond SP-II and SP-III and many others are required.

Yes it says Dexron in the manual. I have been using Transmission Fluid, Moble-1 ATF D/M in my 69 Cadillac. This one confirms to Dexron III-H standard. How about this?

Its a 3-speed Auto.

Hi, I am new to the forum to some extent. What transmission oil is recommended in a 77 280z? Really appreciate support. Thanks.

@siteunseen are you using stock ECU with the 707s? I would assume yes but just wanted to confirm. Thanks for the thread. Dont want to dig too deep. If they work for you fine i will probably just get these.

Sure. Did the rockauto ones came with O-Rings? Also did u change the fuel pressure regulator? should i get that also from rock? there is a OE version on z car parts which is a bit expensive.

Hi Friends, What would be a good fuel injector replacement option and where can I get them? Would appreciate if you can share experiences. There is one on ebay which is mentioned as stock replacement and is Bosch brand. Let me know. eBay item number: 202569390132

Correct sir - thanks.

http://www.thezstore.com/page/TZS/PROD/classic10a05/12-4330 This seems to be the part you have pointed.

Guys - anyone know if there is an aftermarket replacement and what is the AMP capacity for each? Thanks.

Guys, have been inspecting the engine. Can someone tell me what these two circled white caps are? just caps or relays? My car does not have these caps, instead under each there are 4 terminals. Mine are jumped together. What are they?