457 replies to this topic

[JonnyAlpha]

Finally, after months and months of trying to sort out a twin belt pulley with trigger wheel for this engine, the pulley was now ready to be fitted.

 

So on with the new gasket.

 

 

 

However after fitting the timing chain cover fitting and torquing the original bolt up to 75lb/ft, the pulley was still moving, on taking it apart, I identified that the original bolt had a step on it and it was that step that was causing the bolt not to clamp down onto the washers and pulley sufficiently to secure it.

 

I had a new bolt, but I tried to fit it before and it would not go past the first couple of turns. I thought this was a different thread, but after seeking advice all crank bolts are the same. to be honest the threads looked a little damaged.

 

 

I cleaned up the threads and managed to screw the bolt all the way in, so with a new lock washer I did it up and torqued it.

 

[imack]

Hate to put a spanner in the works but I'd be concerned about using a duplex chain with joining pins and circlips along with the oil flinger fitted.


See attached post, page 2 for contact between longer joining pins and oil flinger and potential removal of circlips.

https://www.theminif...arschain/page-2

Attached Files

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Edited by imack, 20 February 2023 - 08:14 PM.

[JonnyAlpha]

Hate to put a spanner in the works but I'd be concerned about using a duplex chain with joining pins and circlips along with the oil flinger fitted.


See attached post, page 2 for contact between longer joining pins and oil flinger and potential removal of circlips.

https://www.theminif...arschain/page-2

Hmm, what are my options?

[imack]

Iwis endless chain without joining links.

[Rick Anderson]

Great thread. I am building a similar engine now and this makes me question whether or not I want to continue or buy an off-the-shelf built engine & gearbox. 

[JonnyAlpha]

Great thread. I am building a similar engine now and this makes me question whether or not I want to continue or buy an off-the-shelf built engine & gearbox. 

 

Have I put you off

[JonnyAlpha]

Iwis endless chain without joining links.

 

Looks like the timing cover is coming off again, need another gasket and lock.

Where's the best place to get a guaranteed ggod quality endless IWIS Duplex chain. Somerford do them here.

[imack]

Somerfords are probably OK.
I've only ever bought them from MED, but their postage tends to be a bit steep unless you're buying a lot of parts.

https://www.med-engi...s-timing-chains

[Java_Green]

 

Great thread. I am building a similar engine now and this makes me question whether or not I want to continue or buy an off-the-shelf built engine & gearbox. 

 

Have I put you off

 

From time to time, I which I had made it "as simple" as you JonnyAlpha....

[Rick Anderson]

 

Great thread. I am building a similar engine now and this makes me question whether or not I want to continue or buy an off-the-shelf built engine & gearbox. 

 

Have I put you off

 

 

Not at all. I enjoy reading through the thread. I have the exact same engine down to the 20142 pistons so this is very helpful. However, I know that I would do the same thing - turn what is supposed to be a "budget build" into a major "might as well" project until I go 10x over budget! So many choices, not enough money. 

[JonnyAlpha]

 

 

Great thread. I am building a similar engine now and this makes me question whether or not I want to continue or buy an off-the-shelf built engine & gearbox. 

 

Have I put you off

 

 

Not at all. I enjoy reading through the thread. I have the exact same engine down to the 20142 pistons so this is very helpful. However, I know that I would do the same thing - turn what is supposed to be a "budget build" into a major "might as well" project until I go 10x over budget! So many choices, not enough money. 

 

 

Yes to be honest if I had stuck to my original plan, this engine would have been in and running by now.

[JonnyAlpha]

Hate to put a spanner in the works but I'd be concerned about using a duplex chain with joining pins and circlips along with the oil flinger fitted.


See attached post, page 2 for contact between longer joining pins and oil flinger and potential removal of circlips.

https://www.theminif...arschain/page-2

 

Well following on from the above post, the seed of doubt was now well and truely sewn, so everything would need to be stripped down and checked.

 

In anticipation, I ordered an endless IWIS Duplex Chain from Calver ST, as I had been in comms with KC and he advised that he sells good quality Duplex Chains. It would appear that a lot of other sellers are selling cheaper lower quality variants. I also ordered a new chain cover gasket and some allen head bolts for my sensor bracket.

 

Upon remove I rotated the engine so that the Duplex Joining Pins were under the Oil Thrower and check the clearance, or lack of it, as seen in this pic.

 

 

If left this would have been a major failure.

 

So time to swap out the chain for an endless one.

 

Before removing the chain and gears I rotated the engine to line up both timing gears dot to dot and marked the location of both gears. I then tapped down the Cam Gear Lock Tab.

 

 

 

 

Now without turning the gears I started to lift off the gears, first using a plastic wedge to lift them away from the timing plate.

 

 

Once the chain and the gears were off it was clean up time.

 

I clearly used too much Hylomar, as seen by the overspill, this could have caused issues.

 

 

Best way to remove it is acetone, so I borrowed the wife's nail polish remover and started the clean up.

 

[JonnyAlpha]

Once the gears and chain were off I could clean up the gasket and after removing the hylomar I considered re-using it.

 

 

However the gasket was split, so I would need a new one.

 

 

I ordered one from eBay (quickest delivery ready for the weekend).

 

 

 

[JonnyAlpha]

So the weekend was upon me and I had some time to get cracking. IWIS chain, allen head bolts, hylomar and a few other bits had all arrived, but no gasket.

Luckily a plea to my local Mini club and hey presto, one of my friends popped around with two!!

 

I removed the old gasket and cleaned up the timing plate.

 

 

Next, after applying a bit of assembly lube to the chain, I put the chain on the timing gears and joined up the dots.

 

 

This chain is tighter than the MSC EVO chain and was a tad difficult to get over bothe gears and keyways, however perseverance won in the end.

 

 

I applied a bead of hylomar to the new gaske.

 

 

Then fitted the gasket and cam nut and torqued it up to 65 lb/ft, I fitted and bent up the old lock tab, this time bending in a different location. I also fitted the original oil thrower.

 

 

When checking the clearance of the oil thrower, I was a little bemused, it was touching the chain links.

 

So I checked the new one and it had better clearance? So I cleaned up the marks and re-used it.

 

 

 

Next item to install was the chain tensioner.

 

 

I then applied a small amount of grease on the timing cover seal and after fitting the crank pulley fitted the timing cover.

 

 

After fitting a few bolts, I removed the pulley to fit the two bolts that sit under it at the bottom. Once they were all in, I torqued them to spec. In the pic above you'll see I have fitted the new Trigger Sensor bracket using my new Allen Bolts.

 

 

This time, following advice, I applied some loctite to the crank bore and bolt.

 

 

 

 

I did the bolt up and torqued to 55 lb/ft, this is lower than spec but what is recommended by Sturat Gurr for his Aluminium Pulleys.

 

 

 

Edited by JonnyAlpha, 01 March 2023 - 06:21 PM.

[gazza82]

This chain is tighter than the MSC EVO chain and was a tad difficult to get over bothe gears and keyways, however perseverance won in the end.

The two duplex I've fitted were both tight to fit the gears .. hence the lack of tensioner.

One was to a 1098cc Midget engine in the 80s and one to the 1330cc Midget engine going into my A35 at some point in the future ...