2019, July. New engine work back on track

When we got back from holidays I could get on with building the new engine. The pistons and exhaust manifold had been machined so I collected them from Alex at Maynards.

Modified pistons, height reduced and pockets re-cut.

 And now they don't come above the block face!

Modified pistons fitted and more like it should be.

I sorted through my various spares to find the best set of sprockets and guides to use and fitted a new tensioner making sure it was a trusted type - not one of the dreaded Rolon ones that regularly shed the rubber pad like the one is this picture.

Typical Rolon failed tensioner, the rubber pad has come off

I chose the best ones to use out of this lot

Chain fitted with new tensioner, note spacer to aid setting up.

 This was all to do a test fitting so I could make sure there was enough clearance between the valves and pistons when the engine turned over.  I used some Blutack in the valve pockets to act as a check, if it got squashed too thin I would have been in trouble, but all was well.

Blutack in valve pockets to test valve clearance.

Having checked the valves would not hit the pistons I could now fit the head and timing chain stuff properly.  This went well until I checked the camshaft timing marks.  I tried setting the chain in different places on the sprocket and also tried turning the sprocket 180 degrees but there was no way to get the cam lined up properly.

Timing marks are close but not correct.

Next thing was to try using one of my other spare cam sprockets to see if that would give a better result and look what I got, a perfect setting!

That is more like it! Spot on.

Starting to look like an engine.

Next thing with the head on and torqued down was the water pump and cover.  I had a new old stock 12 vane pump which slotted in very easily and a new cover to match so they went on with the gaskets chosen to give the correct clearance .

Heater outlet plate on rear of th head

The distributor that came with the ex rally car engine looked pretty scruffy but testing the shaft for play it seemed in reasonable condition so I thought it would be worth stripping and cleaning to check. Turns out it was in very good condition with no noticeable wear in the shaft so after a good clean up it all went back together and into the new engine.

Looks a bit rough?

But the shaft is in excellent condition.

And no wear in the bearings.

The distributor also had Lumenition installed and it tested OK when I connected it to an amplifier module so that is a bonus.

Distributor and water pump fitted.

Next job was to sort out the inlet manifold for the twin 45DHLA carbs that goes on the engine.Its a new one so has never been used before but a test fit found that it fouled on the water pump outlet. There should be a small gap between the top of the water pump cover and the underside of the manifold.  There is a short link pipe with O rings that fits inside them and joins the two together. I had to file about 1/16" off both the manifold and the pump cover to achieve the gap required.  Best to find out now rather than when the engine is in the car!

Picture showing correct small gap after filing.

I found a piece of steel in my scrap bin that fitted perfectly to hold the flywheel while I torqued up the bolts and fitted the clutch cover.

"special tool" from the scrap bin holds the flywheel

The clutch went on with a new cover and a new old stock competition friction plate that I had bought several years ago and the engine is now ready to fit in the car.

NOS competition clutch plate

STR 0415 NOS competition clutch plate

Engine ready to fit

October 2014, Gathering parts for new Sprint engine

Keeping track of bits with this useful gadget

Got a call from Mark Maynard that my block was ready to collect with its new liner installed and they have done a very nice job.  I spent an afternoon cleaning it off thoroughly in their wash tanks before bringing it home for a spot of paint. The bottom end has also been fully balanced which should help things along.

"New" block ready to start build

Started a little test fitting and tried the timing cover on the block - it was too tall!   Curses.  
Obvious really, they had to face the top of the block when they did the liner and now the cover was left about 10-12 thou proud so I had to take it back to be matched up.

The machine shop had also made up a few tappet shims because the re-profiled cam needs thicker sizes than the standard range so I can get on setting up the head.

  Fun job starts here.

And when all the valves were bedded in it looked like this

 I hope I put the valve springs on the right way up!

 

I don't need to add anything about this picture except the one you need is always missing!

 

The two pictures above show the differences between a standard TR7 flywheel and the Dolomite Sprint one. The TR7 has quite a bit more material on the rear face but the important working dimensions are the same. The Dolly one is also about 2kg lighter so guess which one I will be using?

Crank with the Dolly flywheel all balanced up.

...............................................................................................

I bought some posh stuff for the motor as well

Adjustable camshaft sprocket.

 45DHLA Dellorto carburettors

Shiny new manifold for the 45's