4AG Breathing Work

Picked up my cylinder head back from the shop 🙂 Several years of carbon build-up now gone, I was more than happy to torque it down with a new gasket:

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Sealed in between is now a TRD 0.8mm MLS gasket.

Having the opportunity to replace all the seals finally came. Over the past years I only upgraded the head with lighter internals and didn’t do much more. The overhaul was much needed given how much carbon build-up existed.

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Inspecting and reviewing the work after getting it back.

The block was cleaned up and the new gasket was prepared. Took the opportunity to install a thinner piece to increase the compression just slightly.

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TRD 0.8mm gasket. The cylinder walls were fine by the way, I dislodged some carbon build-up – which was promptly removed to avoid any problems ahead.

Eventually, everything was torqued down by hand – including the extra angles. From memory, I was referring to two torque specs: comparisons with the TRD manual and the owner’s manual.

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After torquing things down by hand, I started installing the new manifold.

My old, rusty EX manifold was quite leaky… it didn’t seal well around the flanges and was covered with holes. I had an FGK one prepared earlier and decided to mount it in.

This was a little challenging with all the accessories, but we got there in the end:

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It wasn’t easy getting the EX manifold in neatly…

It was wrapped with several towels to handle all the knocking about. Its low weight helps with installing from the ground – its easier to manoeuvre compared to stock.

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Eventually got it through from the bottom of the body.

A new bracket to support the 4-1 configuration (OEM is 4-2-1) was supplied. The ring holds the pipes by the neck and offers enough clearance for any movement in the chassis. Bolt patterns are exactly the same as the original and installs in the same location on the transmission housing. At least for RHD models.

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A new support bracket was included for the 4-1 setup

Next up was the exhaust muffler. Its bling puts me in a trance every time… The craftsmanship can really be appreciated in person:

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Stainless steel, single tip Fujitsibo muffler. It has beautiful welding work

I was happy to know that the rubber mounts were healthy and re-usable – the system all hangs from the same locations and provide the same level of freedom when moving about.

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Muffler in place with no fitment issues

With the EX manifold and muffler in, the foundation for the remaining units were ready. The remaining was additional piping and a sports catalytic converter.

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A new catalytic converter ready to go in.

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