Here’s a fantastic and recent (June 2023) 1998 V70 T5 head rebuild and documented installation with excellent photos and comments, including parts and where to find them. The thread follows MVS Forums moderator Song from the beginning with code P0301 symptoms/diagnosis — “This should be an interesting journey.” — to parts buying, then through to completion. It’s good to read through this recent head job because, simply, many parts are hard to find now.
songzunhuang » So I finally completed the job and fired up the car! It’s running good as new, but it wasn’t without a few incidents. It took me a lot longer than anticipated because I did a lot of things on top of the rebuild.
Here’s a picture just before putting the cam cover back on. The gasket material is applied, cams and lifters installed.Cam cover with gasket material
Hose Upgrades
I replaced several hoses with upgraded silicon versions. I also concluded that silicon was an unnecessary expense. Regular hoses would have probably been fine.
Fuel Injector
I broke a cap on the pintle for one of the fuel injectors. I got a new injector, but discovered it was the wrong one. It should have been obvious since the injector was a different color. Duh. You can see it in the picture below. I tried to run it with the new injector and of course got a misfire code! That made my heart drop. I ended up harvesting the new bits on the new injector and putting it on the old. Everything was fine after. For reference, the white injectors have a 34.6 lb/hr rating while the orange ones have 19.9 lb/hr. I learned this after the fact when I conducted some more research online.
Bad orange injector
Coolant Temp Wiring Harness
When I first started up the car, the electric fan came on full blast. I have seen this before! Checking the connector, I saw that the female side was completely crumbled and not making contact. I used some needle nose pliers to push the contacts in all the way and that fixed the issue, but the connector isn’t doing much now. For the life of me, I can’t find anyone who can sell me the female side of the harness that clips into the coolant temp sensor. This may be a future Pick N Pull run.
Battery Terminal “U” Nut
The negative terminal U shaped nut broke. Once again, I can’t find these anywhere. When I contacted various online shops, they wanted to sell me a new negative cable assembly for $100+. All I needed was the nut. I ended up using a hose clamp. Yea, very elegant.Elegant clamp
Exhaust Manifold Gaskets
I tried to do something clever and it failed. Used Permatex copper high temp gasket material to secure the gaskets on the manifold before installing the head. The idea was to install the head without the exhaust studs, which is a lot easier as the head can go straight down on to the block. Well, what I didn’t anticipate was that as I tighten the head down, it dragged the gaskets down as well. I spent a lot of time aligning the gaskets holes for the studs before putting in the exhaust studs. Lesson learned.Before install of head
So those were my struggles. All in all it took me closer to 15 hours to do everythingI (Head, timing belt, new lifters, new hoses, new coolant assembly, cleanup, etc.) I have taken the red brick for a few drives since completion and it’s doing great. Smooth and no more codes. It is very satisfying and I hope it lasts another 200K+ miles!
Oh, I have a complete set of apparently good used hydraulic lifters if anyone needs them for cheap. I’ve posted that in the classifieds here: viewtopic.php?t=102551
Finally, I should mention an invaluable resource I used – http://www.atthetipwebs.com/technologyi … gasket.htm
I printed this out and used it as a checklist.
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So I finally completed the job and fired up the car! It’s running good as new, but it wasn’t without a few incidents. It took me a lot longer than anticipated because I did a lot of things on top of the rebuild.