Jump to content
SAU Community

Recommended Posts

On 08/11/2023 at 3:06 PM, Komdotkom said:

Make a basic slide hammer out of a bit of all thread the plugs are not that tight (which always surprises me).

 

 

What size all thread are we talking here. It be pretty thin wouldn't it?

Anyway, valves have arrived from both partsouq and amayama. Also got a nifty adjustable tapered ring compressor cheap off eBay, looks like it's been used once 

 

IMG_20231108_142539434.thumb.jpg.c9311385ab4ee574439405a0a15e5b03.jpg

 

IMG_20231108_142604562.thumb.jpg.9af20877804bf400393705d9a17c01fe.jpg

 

IMG_20231108_142610249.thumb.jpg.50d6a19453b09d3f38eadf615d73751a.jpg

Still waiting on the rods, meant to be here in the next hour according to auspost. Considering the torrential rain that just started, I reckon the posty will probably hold it for tomorrow or drop back at the post office.

  • Like 1

Be careful with that type of ring compressor they are known to snap rings.

 

Single size tapered ring compressor from someone like is a better option but obviously only suits one bore size.

 

Go slow, lots of lube, just generally good advice..

 

 

 

 

Dang, it's company 23 brand. Meant for subarus. Seems like the tools made for them are about as good as the cars, sti's excluded. I bought that one as I though being tapered I wouldn't have to knock the piston down. It's only adjustable from like 78 -86.8mm. if the ring ends aren't in the 10mm of open gap I can't see how it's going to be an issue. Anyway, I'll be careful and treat it like a virgin. Plenty of lube, proceed with caution.

 

Rods have been delivered, I'm not home ATM to check them out. Will do later.

Valve guides you mean. Well I don't have a definitive answer but now that I have the valves in my possession, going to visit the local supplier that has listings for rb25 guides and work out if any are suitable. If not, I'm stuck. May have to ring Nissan and see if they have stock and how far I have to bend over..

  • Like 1

Just spent some time this morning weighing up the rods on some super accurate scales at work. Pretty damn good. They're advertised as being within a gram of each other. They where much better than that at around 0.3 of a gram. Not bedh. They're close to 80 grams lighter each than stock too.

Preliminary measurements of the bores of the big and little ends are spot on using the internal mic. I'm getting really good with using those now, can get accurate measurements quicker. I'm hoping to use the bore dial on them a bit later to confirm my measurements and roundness a bit better.

 

IMG_20231109_071017872.thumb.jpg.db8a31575c263630529c20be411f6e5c.jpg

  • Like 4

That's awesome! 

My piston/rod assemblies were up to 8g out of balance, machine shop said 3g is nice for a street engine on stock components so I balanced them down to 1g because I'm an idiot who thought spending literally 10hrs on that was a good idea...

  • Like 1
  • Haha 1

I haven't weighed the piston assemblies yet, watch this space. 

What are people's thoughts on how to select which weights go where? Pair 2 that are closest in weight and run them as matched pairs?  I was thinking of doing that and putting the 2 heaviest in the middle. Don't know how I came up with that.

Probably wouldn't matter 1 bit but I'm here and would only take a minute to arrange. 

See what the total weight is for a given piston/rod assembly, including rings/pins/bearing shells, rod bolts. 

If you can just move parts around to get them all within 1g for a total assembly or so you are golden.

If not, move them around such that the weight differences are minimal vs everything else, I.E don't put all your lightest things together on one piston/rod assembly as now you need to bring everything down. 

"Best" way is watch matching each component and adjusting as necessary, I only went as far as doing rods/pistons individually as the variance between ring sets/rod bolts/and shells was miniscule on a 3 decimal scale. Also using a rod weighing assembly so big and small end can be reviewed separately as there's more to it than just total weight. 

New forged rods will be basically spot on for this purpose, it'll only be the pistons that might need attention. Cast pistons usually vary a little, just depends on the batch, if you have to remove material you do it VERY gradually around the pin boss (where the gudgeon goes through) on the inside, do not touch the crown/skirts etc - lots of videos online. 

I'm waiting to see if a few 7k rpm trips blows a piston up from stress risers... 

 

  • Like 1
2 hours ago, admS15 said:

Just spent some time this morning weighing up the rods on some super accurate scales at work. Pretty damn good. They're advertised as being within a gram of each other. They where much better than that at around 0.3 of a gram. Not bedh. They're close to 80 grams lighter each than stock too.

Preliminary measurements of the bores of the big and little ends are spot on using the internal mic. I'm getting really good with using those now, can get accurate measurements quicker. I'm hoping to use the bore dial on them a bit later to confirm my measurements and roundness a bit better.

 

IMG_20231109_071017872.thumb.jpg.db8a31575c263630529c20be411f6e5c.jpg

Hmm. This is making me want to unnecessarily rebuild my engine.

image.thumb.png.f21b1f9defb027ae73582aeea67fa1d0.png

  • Haha 3
20 minutes ago, admS15 said:

Hey @PranK is something funny going on in the forum. New posts don't seem to be showing for me. I only see posts from like a week ago. Is it just me?

 

Nah, it's borked. Depends on what you mean by "new posts don't show". I see new posts, but the latest posts page isn't working, and other issues. There's 2 reports of this in the feedback forum.

Re valve guides. I have a freaking headache. Been down the rabbit hole trying to work out what's what. Nissan wants 65 each for intake (in stock) 85 for exh (import from jap)

I read an old SAU thread where CA18 guides where used for intake on an rb25 and had to be trimmed down 2mm as slightly too long.

I found this in the fsm

Screenshot_20231109-180534.thumb.png.ff4686ce10e417871724110a15bfd2be.png

If I'm reading that correctly, the only difference between the in and exh valves for the purpose of the guides is 2mm in shaft length and a minute diameter difference of shaft which will be accounted for with reaming.

So I'm thinking the CA guides should work. The exhaust should fit straight in and the inlet trimmed 2mm.

I've come across nason guides part numbers

PVG9019 10.03mm OD 5.994 ID 40.005 length listed as CA18 and RB25DE/DET 

Also PVG9018 same ID and OD but 42.926 length. Listed only for CA18.

I believe PVG9019 should work or do I buy 2 of each? I know the best bet would be to get the old ones removed and measured but I'd rather give the shop all the bits and pieces so they don't have to stop half way and wait for parts. I've got an even bigger headache now. Going to get some Panadol.

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • This is where I share pain with you, @Duncan. The move to change so many cooling system pieces to plastic is a killer! Plastic end tanks and a few plastic hose flanges on my car's fail after so little time.  Curious about the need for a bigger rad, is that just for long sessions in the summer or because the car generally needs more cooling?
    • So, that is it! It is a pretty expensive process with the ATF costing 50-100 per 5 litres, and a mechanic will probably charge plenty because they don't want to do it. Still, considering how dirty my fluid was at 120,000klm I think it would be worth doing more like every 80,000 to keep the trans happy, they are very expensive to replace. The job is not that hard if you have the specialist tools so you can save a bit of money and do it yourself!
    • OK, onto filling. So I don't really have any pics, but will describe the process as best I can. The USDM workshop manual also covers it from TM-285 onwards. First, make sure the drain plug (17mm) is snug. Not too tight yet because it is coming off again. Note it does have a copper washer that you could replace or anneal (heat up with a blow torch) to seal nicely. Remove the fill plug, which has an inhex (I think it was 6mm but didn't check). Then, screw in the fill fitting, making sure it has a suitable o-ring (mine came without but I think it is meant to be supplied). It is important that you only screw it in hand tight. I didn't get a good pic of it, but the fill plug leads to a tube about 70mm long inside the transmission. This sets the factory level for fluid in the trans (above the join line for the pan!) and will take about 3l to fill. You then need to connect your fluid pump to the fitting via a hose, and pump in whatever amount of fluid you removed (maybe 3 litres, in my case 7 litres). If you put in more than 3l, it will spill out when you remove the fitting, so do quickly and with a drain pan underneath. Once you have pumped in the required amount of clean ATF, you start the engine and run it for 3 minutes to let the fluid circulate. Don't run it longer and if possible check the fluid temp is under 40oC (Ecutek shows Auto Trans Fluid temp now, or you could use an infrared temp gun on the bottom of the pan). The manual stresses the bit about fluid temperature because it expands when hot an might result in an underfil. So from here, the factory manual says to do the "spill and fill" again, and I did. That is, put an oil pan under the drain plug and undo it with a 17mm spanner, then watch your expensive fluid fall back out again, you should get about 3 litres.  Then, put the drain plug back in, pump 3 litres back in through the fill plug with the fitting and pump, disconnect the fill fitting and replace the fill plug, start the car and run for another 3 minutes (making sure the temp is still under 40oC). The manual then asks for a 3rd "spill and fill" just like above. I also did that and so had put 13l in by now.  This time they want you to keep the engine running and run the transmission through R and D (I hope the wheels are still off the ground!) for a while, and allow the trans temp to get to 40oC, then engine off. Finally, back under the car and undo the fill plug to let the overfill drain out; it will stop running when fluid is at the top of the levelling tube. According to the factory, that is job done! Post that, I reconnected the fill fitting and pumped in an extra 0.5l. AMS says 1.5l overfill is safe, but I started with less to see how it goes, I will add another 1.0 litres later if I'm still not happy with the hot shifts.
    • OK, so regardless of whether you did Step 1 - Spill Step 2 - Trans pan removal Step 3 - TCM removal we are on to the clean and refill. First, have a good look at the oil pan. While you might see dirty oil and some carbony build up (I did), what you don't want to see is any metal particles on the magnets, or sparkles in the oil (thankfully not). Give it all a good clean, particularly the magnets, and put the new gasket on if you have one (or, just cross your fingers) Replacement of the Valve body (if you removed it) is the "reverse of assembly". Thread the electrical socket back up through the trans case, hold the valve body up and put in the bolts you removed, with the correct lengths in the correct locations Torque for the bolts in 8Nm only so I hope you have that torque wrench handy (it feels really loose). Plug the output speed sensor back in and clip the wiring into the 2 clips, replace the spring clip on the TCM socket and plug it back into the car loom. For the pan, the workshop manual states the following order: Again, the torque is 8Nm only.
    • One other thing to mention from my car before we reassemble and refill. Per that earlier diagram,   There should be 2x B length (40mm) and 6x C length (54mm). So I had incorrectly removed one extra bolt, which I assume was 40mm, but even so I have 4x B and 5x C.  Either, the factory made an assembly error (very unlikely), or someone had been in there before me. I vote for the latter because the TCM part number doesn't match my build date, I suspect the TCM was changed under warranty. This indeed led to much unbolting, rebolting, checking, measuring and swearing under the car.... In the end I left out 1x B bolt and put in a 54mm M6 bolt I already had to make sure it was all correct
×
×
  • Create New...